Replaced use of AppWindowToken.allAppWindows with WindowToken.windows

After ag/1290328 the 2 list now contain the same entries. The only
different is allAppWindows is not sorted and windows is. Removing
allAppWindows and only having one windows list for a token object
reduces confusion in the codebase and also removes a major source
of bugs.

Bug: 30060889
Change-Id: I6e9a3a4b52cfd686788fe18f4fd6c9b0731f10bd