Remove all instances of always zero `asset_id` from smart contracts

[Danny (Sacrificial Pancakes)]

all smart contract functions that use the "asset_id" param will have that removed. All code calling these functions will need to be updated.

The functions affected are:
get_vega_id
get_asset_source_and_asset_id (will now be get_asset_source)
list_asset
remove_asset
set_deposit_minimum
withdraw_asset
deposit_asset
is_asset_listed
get_deposit_minimum