fix: duplicate warnings (#480)

dzgui/views/base.py

@@ -1,6 +1,5 @@
 import logging
 import signal
-import warnings
 
 from typing import TYPE_CHECKING, Literal, Self
 
@@ -345,7 +344,5 @@ try:
     icons = theme.list_icons(None)
     if STEAM_ICON not in icons:
         logger.warn(strings.steam_icon_missing)
-        warnings.warn(strings.steam_icon_missing, stacklevel=2)
 except Exception as e:
     logger.warning(e)
-    warnings.warn(strings.gtk_theme_missing, stacklevel=2)