Replace raise with return for Ctrl+C in Windows

- Replace the raise `const.CtrlC` with `return const.CtrlC` the match the
  unix implementation and prevent a stacktrace when cancelling a command
  on Windows

thefuck/system/win32.py

@@ -16,7 +16,7 @@ def get_key():
         ch = msvcrt.getch()  # second call returns the actual key code
 
     if ch == b'\x03':
-        raise const.KEY_CTRL_C
+        return const.KEY_CTRL_C
     if ch == b'H':
         return const.KEY_UP
     if ch == b'P':