[Glitch] Add ability to filter individual posts

Port 50487db122 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/util/async-components.js

@@ -177,3 +177,7 @@ export function FollowRecommendations () {
 export function CompareHistoryModal () {
   return import(/*webpackChunkName: "flavours/glitch/async/compare_history_modal" */'flavours/glitch/features/ui/components/compare_history_modal');
 }
+
+export function FilterModal () {
+  return import(/*webpackChunkName: "flavours/glitch/async/filter_modal" */'flavours/glitch/features/ui/components/filter_modal');
+}