[TASK] Delete old transfer code

[1xstj]

Currently we have two seperate places where we handle substrate/evm transfers

tangle/pallets/services/src/lib.rs

Lines 1043 to 1046 in cf0a07b

	// origin check.
	let evm_origin = evm_origin.ok_or(Error::<T>::MissingEVMOrigin)?;
	let mapped_origin = T::EvmAddressMapping::into_account_id(evm_origin);
	ensure!(mapped_origin == caller, DispatchError::BadOrigin);

and

tangle/pallets/multi-asset-delegation/src/functions/deposit.rs

Line 60 in cf0a07b

Asset::Erc20(asset_address) => {

We should unify this code to a single place, easier to test