windowManager.js: Fix cleanup of WorkspaceOsd instances. The monitor index is being passed, but can't be assumed to be the array index also. Track by key/values instead. ref: https://bugzilla.redhat.com/show_bug.cgi?id=2341980
windowManager.js: Fix cleanup of WorkspaceOsd instances. The monitor index is being passed, but can't be assumed to be the array index also. Track by key/values instead. ref: https://bugzilla.redhat.com/show_bug.cgi?id=2341980