Reduce unnecessary redraw of wallpaper with shell transition

Wallpaper only needs to draw once in most of cases. It usually
only changes visibility, so the redraw doesn't make any effect
but the latency.

This may reduce ~20ms latency while swiping up to recents with
shell transition.

Also limit adjustWallpaperWindows for shell rotation in
ensureActivitiesVisible, because only shell rotation needs to
capture a closing state of wallpaper.

Bug: 231435331
Test: adb shell setprop persist.wm.debug.shell_transit 1; reboot
      adb shell wm logging enable-text WM_DEBUG_DRAW
      Swipe to recents and check there is no log "finishDrawing"
      of wallpaper.
Change-Id: Iee1bed1ebee986c096f930759571eb147abad56d