Don't reset the capture mode after each frame when using the CallbackAPI

When multiframe skp support was introduced it set the capture mode to
none for everything but the multiframe use case. This was incorrect in
the case of the CallbackAPI where we want to continue to capture frames.

Bug: 152084866
Test: hwui_unit_tests
Change-Id: I7e3caf41a3725d03252df1ab7bedfe1b69a238c2