cs_default.py: Don't import gi.repository.*

It's not good practice, and:
#13091 (comment)

Author: mtwebster

files/usr/share/cinnamon/cinnamon-settings/modules/cs_default.py

@@ -4,7 +4,10 @@
 
 from SettingsWidgets import SidePage
 from xapp.GSettingsWidgets import *
-from gi.repository import *
+
+import gi
+gi.require_version('GioUnix', '2.0')
+from gi.repository import Gio, GioUnix, Gtk
 
 PREF_MEDIA_AUTORUN_NEVER = "autorun-never"
 PREF_MEDIA_AUTORUN_X_CONTENT_START_APP = "autorun-x-content-start-app"