Remove config specific size for HeaderTileLayout

HeaderTileLayout width should always be MATCH_PARENT. The width is
controlled at the QSContainerImpl level by making it the width of
notification panel and it's MATCH_PARENT all the way down.

Test: visual, using emulator on really high density screen and phone
Fixes: 128776927
Change-Id: I3d5dc679cb77fb50ccadd6c3cb86a022e5f02f70