frontend/dri: Initialize callbacks in dri_swrast_kms_init_screen
This was missed in the commit below.
Closes: #8232 (closed) Fixes: 7d5b1cd0 ("frontend/dri: move callbacks from the VTable into dri_screen, dri_drawable")
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This was missed in the commit below.
Closes: #8232 (closed) Fixes: 7d5b1cd0 ("frontend/dri: move callbacks from the VTable into dri_screen, dri_drawable")