fix: invalid handling of empty persistent initial memory on CUDA

[Golovanov399]

No description provided.

[github-actions]

group	app.proof_time_ms	app.cycles	app.cells_used	leaf.proof_time_ms	leaf.cycles	leaf.cells_used
verify_fibair	(-5 [-2.2%]) 227	322,610	2,058,654	-	-	-
fibonacci	(+14 [+1.4%]) 981	1,500,209	2,100,402	-	-	-
regex	(-15 [-0.6%]) 2,334	4,137,502	17,695,216	-	-	-
ecrecover	(-11 [-1.5%]) 714	122,859	2,265,100	-	-	-
pairing	(+13 [+0.9%]) 1,431	1,745,742	25,468,210	-	-	-

Commit: 18ba98e

Benchmark Workflow