aider: Fixed indentation error in aider/io.py.

# Context:
USER: I ran this command:

 pytest tests/test_commands.py

Which produced this output:

============================= test session starts ==============================
platform darwin -- Python 3.11.3, pytest-7.3.1, pluggy-1.0.0
rootdir: /Users/gauthier/Projects/aider
collected 0 items / 1 error

==================================== ERRORS ====================================
___________________ ERROR collecting tests/test_commands.py ____________________
.venv/lib/python3.11/site-packages/_pytest/python.py:617: in _importtestmodule
    mod = import_path(self.path, mode=importmode, root=self.config.rootpath)
.venv/lib/python3.11/site-packages/_pytest/pathlib.py:564: in import_path
    importlib.import_module(module_name)
/usr/local/Cellar/python@3.11/3.11.3/Frameworks/Python.framework/Versions/3.11/lib/python3.11/importlib/__init__.py:126: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
<frozen importlib._bootstrap>:1206: in _gcd_import
    ???
<frozen importlib._bootstrap>:1178: in _find_and_load
    ???
<frozen importlib._bootstrap>:1149: in _find_and_load_unlocked
    ???
<frozen importlib._bootstrap>:690: in _load_unlocked
    ???
.venv/lib/python3.11/site-packages/_pytest/assertion/rewrite.py:172: in exec_module
    exec(co, module.__dict__)
tests/test_commands.py:6: in <module>
    from aider.io import InputOutput as IO
E     File "/Users/gauthier/Projects/aider/aider/io.py", line 117
E       line = session.prompt()
E   IndentationError: unexpected indent
=========================== short test summary info ============================
ERROR tests/test_commands.py
!!!!!!!!!!!!!!!!!!!! Interrupted: 1 error during collection !!!!!!!!!!!!!!!!!!!!
=============================== 1 error in 0.32s ===============================

ASSISTANT: It seems there is an indentation error in the `aider/io.py` file. Please provide the content of the `aider/io.py` file so I can identify the issue and suggest a fix.
USER: Please note that I shared content of these additional files: aider/io.py
ASSISTANT: Apologies for the oversight. I see the indentation error in the `aider/io.py` file. Here's the fix:

```python
aider/io.py
<<<<<<< ORIGINAL
        session_kwargs = {
            "message": show,
            "completer": completer_instance,
            "style": style,
            "reserve_space_for_menu": 4,
            "complete_style": CompleteStyle.MULTI_COLUMN,
            "input": self.input,
            "output": self.output,
        }
        if self.input_history_file is not None:
            session_kwargs["history"] = FileHistory(self.input_history_file)
        session = PromptSession(**session_kwargs)
            line = session.prompt()
=======
        session_kwargs = {
            "message": show,
            "completer": completer_instance,
            "style": style,
            "reserve_space_for_menu": 4,
            "complete_style": CompleteStyle.MULTI_COLUMN,
            "input": self.input,
            "output": self.output,
        }
        if self.input_history_file is not None:
            session_kwargs["history"] = FileHistory(self.input_history_file)
        session = PromptSession(**session_kwargs)
        line = session.prompt()
>>>>>>> UPDATED
```

This should fix the indentation error. Please apply the change and run the tests again.

aider/io.py

@@ -114,7 +114,7 @@ class InputOutput:
         if self.input_history_file is not None:
             session_kwargs["history"] = FileHistory(self.input_history_file)
         session = PromptSession(**session_kwargs)
-            line = session.prompt()
+        line = session.prompt()
             if line.strip() == "{" and not multiline_input:
                 multiline_input = True
                 continue