fix: add missing win32api import for Windows MPV monitor

- Fixes NameError when Windows monitor tries to format error messages
- Resolves Windows compatibility issues with MPV scrobbling

Author: Crazy

trakt_scrobbler/player_monitors/mpv.py

@@ -16,6 +16,7 @@
     import select
     import socket
 elif os.name == 'nt':
+    import win32api
     import win32event
     import win32file
     import win32pipe