Fix grant contract cli command description

[pinosu]

Currently in the description the grantee is the second argument, but it should be the first according to the implementation.
It should be:
wasmd tx wasm grant contract [grantee] [message_type=\"execution\"|\"migration\"] [contract_addr_bech32] --allow-raw-msgs [msg1,msg2,...] --allow-msg-keys [key1,key2,...] --allow-all-messages instead of wasmd tx wasm grant contract [message_type=\"execution\"|\"migration\"] [grantee] [contract_addr_bech32] --allow-raw-msgs [msg1,msg2,...] --allow-msg-keys [key1,key2,...] --allow-all-messages