anv: Fix wait_count missing increment

If we don't wait on anything, I bet it makes the QueuePresent faster,
but also completely wrong...

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Fixes: 02f94c33 ("anv: don't wait for completion of work on vkQueuePresent()")
Closes: #4276
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <!9211>
35 jobs for !9211 with review/submit-thread-fix in 6 minutes and 53 seconds (queued for 2 seconds)
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meson-android

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