Bug 1004329 - [Flatfish][Homescreen] Returning home (landscape) from portrait app causes app icons to misalign/overlap

* Fix ScreenHelper width/height error due to mediaQueryListener being fired twice right after maketplace app closed.
Merge pull request #22025 from begeeben/1004329_returning_home

Bug 1004329 - [Flatfish][Homescreen] Returning home (landscape) from portrait app causes app icons to misalign/overlap, r= Cristian Rodriguez (:crdlc)

* Fix ScreenHelper width/height error due to mediaQueryListener being fired twice right after maketplace app closed.