user32/tests: Do not stop checking the message list when skipping an optional or unsupported message.
This was either added by accident, or in an attempt to stop checking the message list once we hit a winevent hook todo [and accidentally given too wide of a scope]. However, the same commit also uses a global counter to ensure that only one winevent todo is printed, so we don't need to break here anyway.
Fixes: a72bffe7