RecentsPanelView: remove internal getter for isHighEndGfx()

if we're going to store this as a global we might as well set it in the construct
instead of looking for it every time the recents are inflated

Change-Id: Ic38e98e5cf2ae399d51b63089d7cb2ab3ac97f51
Merge "RecentsPanelView: remove internal getter for isHighEndGfx()" into kk44