ui/cocoa: Release specific mouse buttons

ui/cocoa: Release specific mouse buttons

ui/cocoa used to release all mouse buttons when it sees
NSEventTypeLeftMouseUp, NSEventTypeRightMouseUp, or
NSEventTypeOtherMouseUp, but it can instead release specific one
according to the delivered event.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Tested-by: Rene Engel <ReneEngel80@emailn.de>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-ID: <20240224-cocoa-v12-3-e89f70bdda71@daynix.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>