Revert "Allow blocking invites from people you don't share a room with"

This reverts commit ef5585d312. This was
supposed to be in an MR.

src/jobs/neochatgetcommonroomsjob.h

@@ -1,14 +0,0 @@
-// SPDX-FileCopyrightText: 2024 Joshua Goins <josh@redstrate.com>
-// SPDX-License-Identifier: GPL-2.0-or-later
-
-#pragma once
-
-#include <Quotient/jobs/basejob.h>
-#include <Quotient/omittable.h>
-
-// TODO: Upstream to libQuotient
-class NeochatGetCommonRoomsJob : public Quotient::BaseJob
-{
-public:
-    explicit NeochatGetCommonRoomsJob(const QString &userId, const Quotient::Omittable<QJsonObject> &auth = {});
-};