Fix issue with damaged screen not being redrawn

When another window was dragged over a Phosphor window, the Phosphor
window would have streaks drawn over it from the dragged window and
would need to be redrawn. This was handled by an unrequested render
request, where a render request is received that was sent not by the
program itself but by Phosphor.

These unrequested requests were being ignored due to commit 30c61fd,
because of an issue on Windows where programs were receiving upwards of
50 unrequested requests per second for no reason, which was impacting
program performance. They have been re-enabled, pending an investigation
into the cause of these requests on Windows.

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