Search needs to clear the store

[brunnre8]

• The Lounge version: master branch

Currently when we search we add the results to the store.
However this is never cleared again, leading to funny artifacts

client/js/socket-events/search.ts:

socket.on("search:results", (response) => {
	store.commit("messageSearchInProgress", false);

	if (store.state.messageSearchResults) {
		store.commit("addMessageSearchResults", response);
		return;
	}

	store.commit("messageSearchResults", response);
});

After the first search is closed out, state.messageSearchResults is still non empty, meaning a second search will try to add to it, which makes no sense as it may not even be related.

/cc @MaxLeiter that's your bug 😜