[clippy] Fix instances of clippy::match_single_binding
[clippy] Fix instances of clippy::match_single_binding

Closes: #2642
Approved by: bmwill

aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,libra/libra,aptos-labs/aptos-core,libra/libra,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core