pallet-cosmwasm: remove unnecessary `as uXX` casts on literals #1097

Job	Run time
pr-workflow-check / privilege-check	1s
pr-workflow-check / dependency-review	5s
pr-workflow-check / build-all-production-deps	39s
pr-workflow-check / nix-flake-check	50s
pr-workflow-check / build-cosmos-cosmwasm	10s
pr-workflow-check / build-all-rust-qa-packages (x64-monster)	22m 58s
pr-workflow-check / lfs-check	7s
pr-workflow-check / build-all-misc-packages (x64-monster)	1m 27s
pr-workflow-check / build-devnet-xc	38m 39s
pr-workflow-check / build-all-ci-packages	28m 36s
pr-workflow-check / build-all-deps-packages (x64-cute)	12s
pr-workflow-check / build-all-docs-packages (x64-cute)	1m 59s
pr-workflow-check / devnet-integration-tests (x64-cute)	1m 9s
pr-workflow-check / draft-release-check	2s
pr-workflow-check / push-docker-images	0s
pr-workflow-check / draft-release-artifacts	0s
	1h 36m 54s

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