Fixing Symbolic List assignment #6226

Job	Run time
LPython CI (3.10, ubuntu-latest)	8m 5s
LPython CI (3.10, macos-latest)	6h 0m 16s
Test CPython Interop (@pythoncall)	3m 39s
LPython CI (3.10, windows-2019)	15m 3s
Build LPython to WASM	4m 50s
Check Release build	4m 13s
Run SymPy tests	3m 44s
Test PIP Installable Packages	3m 27s
Check Debug build	4m 21s
Run Integration tests with Python 3.9	3m 37s
Run Integration tests with Python 3.10	3m 39s
Run Integration tests with Python 3.11	3m 37s
Run Integration tests with Python 3.12	3m 35s
	7h 2m 6s

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