Cherry-pick: Fix the broken always-on-top mode

[Tian L. (tian-lt)]

Root cause

The types for width and height saved in local settings is not matched universally for all the reads and writes. This leads to a type casting failure which blocks the logics to toggle the AOT mode.

Fix

Change the signature of function ToggleAlwaysOnTop from Task (float, float) to Task (double, double)