Fix the "permission needed" screen disappeared.

It's because we set GONE to the preview pager when we show "permission needed" screen.
The category/wallpaper tiles page depends on the height of the preview pager.
If we set GONE, the category/wallpaper tiles page will cover "permission needed" screen.

Screenshot: https://screenshot.googleplex.com/Zxk8O7HYnBs.png

Bug: 159682850
Change-Id: I0f0ee91f5829b1ee8a82851d0e02a6a19fa165ea
1 file changed