Revert "Add screenshot back to power menu for some devices"

The screenshot button was available in the global actions menu before on
FP3. No reason to force users to switch to a different method now.

This reverts commit 238de217662d27688c644ddcd523bf12b3404d9e.

Issue: FP3-A11#144
Issue: FP3-A11#233
Change-Id: Ie347adb63cca4b5c0eb3174f7370af33f5dff56c
3 files changed