Fixes flashes being useless

Fixes https://github.com/tgstation/-tg-station/issues/5211

You can now disarm people with flashes while stunning them in place for a single tick if their eyes aren't covered, meaning borgs can now drag people's guns away from them if they're murderboning so borgs that aren't sec aren't completely useless for preventing human harm but also cannot stop sec from doing their job.