mesa/st: Fix frontbuffer rendering regression

This fixes a regression introduced with commit
"mesa/st: Reduce the number of frontbuffer flush calls"
where we, after flushing the front buffer marked it as not-rendered-to,
the idea being that it should be marked as "rendered-to" again as soon as
any rendering was touching the front.

Now the latter part never happened, because it was part of a state
validation and we never marked that part of the state as dirty.

So mark the framebuffer state dirty after a frontbuffer flush.
(fdo bugzilla 102496)

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102496
Fixes: eceb671002 (mesa/st: Reduce the number of frontbuffer flush calls)
Signed-off-by: Thomas Hellstrom <[email protected]>
Reviewed-by: Bruce Cherniak <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>
Tested-by: Dieter Nützel <[email protected]>
Tested-by: Bruce Cherniak <[email protected]>
Tested-By: Gert Wollny <[email protected]>

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