[Glitch] Fix selected account being lost when creating a collection

Port f6969f71f886d24f13e182a31209a8cab3735787 to glitch-soc

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

app/javascript/flavours/glitch/reducers/slices/collections.ts

@@ -111,8 +111,11 @@ const collectionSlice = createSlice({
         items: getEditorCollectionItems(collection.items),
       };
     },
-    reset(state) {
-      state.editor = initialCollectionState.editor;
+    reset(state, action: PayloadAction<EditorCollectionItem | undefined>) {
+      state.editor =
+        action.payload !== undefined
+          ? { ...initialCollectionState.editor, items: [action.payload] }
+          : initialCollectionState.editor;
     },
     updateEditorField<K extends keyof EditorState>(
       state: CollectionState,