lokker: update caps-lock hint even on "checking" state

lokker: update caps-lock hint even on "checking" state

Summary:
This fixes the inconsistency in the "Caps Lock is On" hint, if you press
Caps-Lock when lokker is busy with checking the password
(LOKKER_STATE_CHECKING).

Test Plan:
  1. Lock the screen
  2. Enter invalid password (and press Enter)
  3. During password check, press Caps-Lock
The "Caps-Lock is On" should be consistent with the actual Caps-Lock
state.

@fix

Reviewers: zmike

Subscribers: cedric

Differential Revision: https://phab.enlightenment.org/D2171