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zink: remove workaround of FB modifiers forcing present state

Heinrich Fink requested to merge heinrich.fink/mesa:zink-fb-check-swapchain-state into main 
zink: remove workaround of FB modifiers forcing present state

Remove a legacy workaround where presence of modifiers in framebuffer
state results in `needs_present` to be set without a good reason.

This prevents hitting an assertion for framebuffers that use DRM
modifiers, e.g. via GBM BO alloc -> EGLImage import -> GL FBO bind.

Co-authored-by: Daniel Stone <daniels@collabora.com>
Signed-off-by: Heinrich Fink <hfink@snap.com>
Edited by Heinrich Fink

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