Fix bug caused by wrong copy-paste

aleksis/core/frontend/components/app/Splash.vue

@@ -66,7 +66,7 @@ export default {
   height: 16.25%;
   border-radius: 50%;
   aspect-ratio: 1;
-  background: {{ request.site.preferences.theme__primary }};
+  background: v-bind("$vuetify.theme.currentTheme.primary");
   animation-timing-function: cubic-bezier(0, 1, 1, 0);
 }