Stop automatically creating action mode in FS extracted mode.

With Ic025c109539c3b59638, selection action mode is always started
when there is a selection.  This makes it impossible to extend
selection using selection mode.
This blocks creating action mode when full screen extracted mode is
started with selection, but it's same as MNC's behavior.

Bug: 27988877
Change-Id: I9614cb16373029189bfc098b6c1d353326e6b518