repaired color.fish and added fallback

configs/theme.fish

@@ -1,6 +1,10 @@
 # load matugen-generated colors
 if test -f $HOME/.config/fish/configs/colors.fish
     source $HOME/.config/fish/configs/colors.fish
+else
+    if test -f $HOME/.config/fish/configs/fallback_colors.fish
+        source $HOME/.config/fish/configs/fallback_colors.fish
+    end
 end
 
 # Bobthefish display settings