* qt/capslock.h (enum class LockState): New.
* qt/capslock.h, qt/capslock_unix.cpp, qt/capslock_win.cpp
(capsLockIsOn, capsLockState): Rename former to latter. Change return
type to LockState.
* qt/capslock_unix.cpp (capsLockState): Remove check for qApp.
* qt/pinentrydialog.cpp (checkCapsLock): Adapt to changed function name
and return type of capsLockIsOn/capsLockState.