Check conformant reset state together with reset_conformant() success

Check conformant reset state together with reset_conformant() success

Since the conformant is reset right after _input_panel_hide() call,
at the time that immodule receives conformant_reset request from
wl_textinput module, reset_conformant_area() function might return
false since the keyboard geometry is already set to 0x0.
So, even the keyboard geometry is set to 0x0, check the conformant
reset state to ensure there is no preceding conformant reset request
being processed.

Change-Id: I26f7062c52d3f3763167d4cfa87b3437ee7e8ad4