Quote posting requires Soapbox, actually

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

app/soapbox/utils/features.ts

@@ -394,7 +394,7 @@ const getInstanceFeatures = (instance: Instance) => {
      * @see POST /api/v1/statuses
      */
     quotePosts: any([
-      v.software === PLEROMA && gte(v.version, '2.4.50'),
+      v.software === PLEROMA && v.build === SOAPBOX && gte(v.version, '2.4.50'),
       instance.feature_quote === true,
     ]),