[Glitch] Remove old search results with new search

Port 24fb862a65 to glitch-soc

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

app/javascript/flavours/glitch/reducers/search.ts

@@ -65,6 +65,9 @@ export const searchReducer = createReducer(initialState, (builder) => {
     (state, action) => {
       state.type = action.meta.arg.type;
       state.loading = true;
+      if (action.type === submitSearch.pending.type) {
+        state.results = undefined;
+      }
     },
   );