Rename Stick Window shortcut to mention workspaces

The Window Manager keyboard shortcut Stick Window is not intuitive in its meaning. #622 (closed) was one example of confusion with this naming. I was also confused by this today as I had mistakenly unset the shortcut and struggled to find it again.

The wording used in the window menu from the title bar is "Always on Visible Workspace" / "Only Visible in This Workspace", which is more clear to me.

I think it would make sense for the keyboard shortcut and the window menu actions for this to be similar to each other. This would help a user who knows how to do this using the window menu to find the related shortcut.

I suggest a new wording for the keyboard shortcut as Stick Window to All Workspaces.