style: fix linting issues in copypaste.py

aider/copypaste.py

@@ -1,7 +1,9 @@
 import threading
 import time
+
 import pyperclip
 
+
 class ClipboardWatcher:
     """Watches clipboard for changes and updates IO placeholder"""
 
@@ -29,6 +31,7 @@ class ClipboardWatcher:
                 except Exception as e:
                     if self.verbose:
                         from aider.dump import dump
+
                         dump(f"Clipboard watcher error: {e}")
                     continue
 
@@ -44,6 +47,7 @@ class ClipboardWatcher:
             self.watcher_thread = None
             self.stop_event = None
 
+
 def main():
     """Example usage of the clipboard watcher"""
     from aider.io import InputOutput
@@ -59,5 +63,6 @@ def main():
         print("\nStopped watching clipboard")
         watcher.stop()
 
+
 if __name__ == "__main__":
     main()