Fix overlapping buttons in Theme settings

As title

src/components/settings_modal/tabs/theme_tab/theme_tab.js

@@ -378,6 +378,11 @@ export default {
         // To separate from other random JSON files and possible future source formats
         _pleroma_theme_version: 2, theme, source
       }
+    },
+    isActive () {
+      const tabSwitcher = this.$parent
+      console.log(this.$parent)
+      return tabSwitcher ? tabSwitcher.isActive('theme') : false
     }
   },
   components: {