Remove `pallet::getter` usage from the pallet-balances #4793

Job	Run time
check-dependency-rules	9s
check-markdown	20s
check-workspace	20s
set-image	10s
check-toml-format	1m 0s
check-umbrella	2m 12s
fmt	1m 17s
check-rust-feature-propagation	2m 3s
test-rust-features	1m 57s
	9m 28s

Provide feedback