vgsp-gl: spend the draw-coverage receipts on real-CB draws

The GL-COVER 12/boot budget was consumed by the pre-CB (synthetic
identity) draws, so no clip-coverage receipt ever described a draw that
used the client's real fixed CB. Emit the receipts only while
svc_gl_cb_img_valid and re-arm the counter whenever a new CB image passes
the strict projection gate, so the first draws after the real matrix
lands carry the cover receipt.

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