fix(frontend): Do not warn when a nested struct is provided as input to main #13874

Job	Run time
build-nargo	2m 16s
build-noir-wasm	3m 30s
build-acvm-js	1m 33s
build-noirc-abi	1m 25s
noirc_abi	1m 18s
ACVM JS (Browser)	1m 20s
ACVM JS (Node.js)	40s
noir_codegen	1m 4s
Noir JS	1m 17s
Example scripts	11s
Check external repo - ${{ matrix.project.repo }}	0s
Integration Tests (Browser)	2m 21s
noir_wasm	1m 53s
Integration Tests (Node)	2m 12s
End	1s
	21m 1s

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