The global actions longpress timeout is currently used for the
screenshot chord. This means that increasing the globalactions
longpress timeout would also increase the time for triggering
a screenshot.
This adds a configuration item specifically for the screenshot
chord.
Bug: 119989329
Test: manual - increase the globalactions timeout and check that
the screenshot chord is not affected.
Change-Id: I6bd8416f7546aa1d2da43f37f3e76edac3ed543b
8f5c95bc17