game_list: Make add-ons column optional

As the add-ons column takes the most processing time out of any (as it needs to search registration for updates/dlc, patch control NCAs, search for mods, etc.), an option was added to disable it. This does not affect the application of add-ons. In large game collections, this decreases game list refresh time by as much as 70%.

src/yuzu/ui_settings.h

@@ -59,6 +59,7 @@ struct Values {
 
     // Game List
     bool show_unknown;
+    bool show_add_ons;
     uint32_t icon_size;
     uint8_t row_1_text_id;
     uint8_t row_2_text_id;