Fix moving windows to a marked workspace by mark.
Fix moving windows to a marked workspace by mark.

When a window is moved to a mark and the marked container is a workspace,
we can skip any other logic and just call con_move_to_workspace directly.

fixes #2003

i3/i3,pronobis/i3,cornerman/i3,Airblader/i3,strake/i3,EvilPudding/i3,acrisci/i3,Airblader/i3-original,shdown/i3,avrelaun/i3,Chr1stoph/i3,MForster/i3,Airblader/i3-original,i3/i3,cornerman/i3,EvilPudding/i3,pronobis/i3,acrisci/i3,Chr1stoph/i3,avrelaun/i3,shdown/i3,stapelberg/i3,acrisci/i3,Airblader/i3-original,ccryx/i3,MForster/i3,cornerman/i3,avrelaun/i3,shdown/i3,Matmusia/i3,Airblader/i3-original,i3/i3,stapelberg/i3,strake/i3,MForster/i3,strake/i3,cornerman/i3,shdown/i3,pronobis/i3,Airblader/i3,Chr1stoph/i3,Airblader/i3-original,strake/i3,acrisci/i3,stapelberg/i3,avrelaun/i3,EvilPudding/i3,Matmusia/i3,acrisci/i3,pronobis/i3,ccryx/i3,ccryx/i3,Airblader/i3,Airblader/i3,Matmusia/i3,Matmusia/i3,Chr1stoph/i3,MForster/i3,i3/i3,strake/i3,stapelberg/i3,ccryx/i3,EvilPudding/i3