Fix for opensubtitles.com cached token not removed when saving providers settings.

bazarr/config.py

@@ -251,6 +251,10 @@ def save_settings(settings_items):
             if key != settings.opensubtitles.username:
                 region.delete('os_token')
 
+        if key == 'settings-opensubtitlescom-username':
+            if key != settings.opensubtitlescom.username:
+                region.delete('oscom_token')
+
         if key == 'settings-subscene-username':
             if key != settings.subscene.username:
                 region.delete('subscene_cookies2')