Remove dup code

https://github.com/chevdor/subwasm/blob/f601a37e918709369434a0ee469a1a6eeb01e9d2/libs/substrate-runtime-proposal-hash/src/lib.rs#L57-L71

	/// Calculate the proposal hash
	///
	/// # Arguments
	/// * `wasm_blob` - The WASM blob
	/// # Returns
	/// * `CalllHash` - The hash of the proposal as calculated on chain
	/// @deprecated
	pub fn get_proposal_hash(wasm_blob: &[u8]) -> Result<CalllHash> {
	get_call_hash(PREFIX_SYSTEM_SETCODE, wasm_blob)
	}

	/// This function replaces the deprecated `get_proposal_hash`
	pub fn get_system_setcode(wasm_blob: &[u8]) -> Result<CalllHash> {
	get_call_hash(PREFIX_SYSTEM_SETCODE, wasm_blob)
	}

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