Fixed incorrect use of walrus operator #11541

Job	Run time
Determine runner type to use / determine_workflow_runner	1s
Set build matrix / set-constants	5s
Runtime Code Coverage (Linux)	1m 21s
Catalyst-Runtime Build (gcc)	53s
LLVM Build (gcc)	26s
MHLO Dialect Build (gcc)	6s
Enzyme Build (gcc)	12s
Quantum Dialects Build (gcc)	3m 16s
Runtime Tests (Linux) (lightning, gcc)	22s
Runtime Tests (Linux) (lightning-kokkos, gcc)	17s
Runtime Tests (Linux) (openqasm, gcc)	19s
Runtime Tests (Linux) (oqc, gcc)	50s
Runtime Tests (Linux) (oqd, gcc)	28s
Frontend Tests (gcc)	10m 12s
Frontend Tests (backend="lightning.kokkos") (gcc)	8m 2s
Frontend Tests (backend="openqasm3") (gcc)	1m 51s
	28m 41s

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