Bugfix: Don’t re-grab pointer/keyboard on MappingNotify (Thanks wilmer)

This fixes bug http://bugs.i3wm.org/545, where characters (of your password)
would rarely slip through when entering your password (especially) after
resuming your notebook from suspend to RAM.

The reason is that when resuming, X triggers one or more MappingNotify events.
At the same time, CPU load is high. This leads to a race-condition between the
ungrab and re-grab in which i3lock temporarily does not grab the keyboard.

One way to fix this is using xcb_grab_server() before and xcb_ungrab_server()
after the ungrab/re-grab. However, I think we actually don’t need to
ungrab/re-grab at all. I seem to have put that code in here by mistake – in i3,
we re-grab after MappingNotify, but there we only grab specific keys. In
i3lock, we grab the whole pointer/keyboard, so there should be no need.

If I’m incorrect and this breaks some subtle use-cases for people with strange
layout setup, at least we can properly document on why we need it, after we put
it back in ;).

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