ui/cocoa.m: Send ctrl-alt key combos to guest if QEMU isn't using thempull-cocoa-20171107

Send those ctrl-alt key combos that QEMU doesn't treat specially to
the guest rather than ignoring them.

All the case where we do special handling of ctrl-alt-X exit the
event handling using a "return" statement, so we can simply allow
the rest to fall through into the normal key handling by deleting
the now-spurious "else".

We take the opportunity to clean up some oddly-formatted and
now rather uninformative comments by removing them.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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