workspace: Unify client removal code
We have 2 equivalent code paths for x11 and wayland unnecessarily, unify them under the same method. Rename m_clients to m_x11Clients so that it's clear what the difference is between m_clients and m_allClients.
We have 2 equivalent code paths for x11 and wayland unnecessarily, unify them under the same method. Rename m_clients to m_x11Clients so that it's clear what the difference is between m_clients and m_allClients.