Fix incorrect check for locked/frozen amount

[Dinonard]

Pull Request Summary

When lock is called, the total_balance needs to be compared against complete frozen balance in dApp staking.
RIght now, incorrect function was called which only returned amount which was actively locked (not undergoing the unlocking period).

[github-actions]

Package	Line Rate	Branch Rate	Health
pallets/astar-xcm-benchmarks/src	88%	0%	✔
precompiles/unified-accounts/src	100%	0%	✔
chain-extensions/unified-accounts/src	0%	0%	❌
pallets/collator-selection/src	92%	0%	✔
pallets/oracle-benchmarks/src	0%	0%	❌
precompiles/xcm/src	73%	0%	➖
primitives/src/xcm	64%	0%	➖
chain-extensions/types/assets/src	0%	0%	❌
pallets/ethereum-checked/src	79%	0%	➖
precompiles/dapp-staking-v3/src/test	0%	0%	❌
primitives/src	62%	0%	➖
chain-extensions/xvm/src	0%	0%	❌
pallets/dapp-staking-migration/src	0%	0%	❌
precompiles/dispatch-lockdrop/src	86%	0%	✔
pallets/unified-accounts/src	86%	0%	✔
pallets/dapp-staking-v3/rpc/runtime-api/src	0%	0%	❌
pallets/astar-xcm-benchmarks/src/fungible	100%	0%	✔
pallets/dynamic-evm-base-fee/src	92%	0%	✔
precompiles/substrate-ecdsa/src	74%	0%	➖
pallets/xc-asset-config/src	64%	0%	➖
precompiles/assets-erc20/src	81%	0%	✔
pallets/inflation/src	83%	0%	✔
pallets/price-aggregator/src	72%	0%	➖
pallets/astar-xcm-benchmarks/src/generic	100%	0%	✔
chain-extensions/types/unified-accounts/src	0%	0%	❌
chain-extensions/pallet-assets/src	56%	0%	➖
pallets/dapp-staking-v3/src/test	0%	0%	❌
precompiles/dapp-staking-v3/src	90%	0%	✔
pallets/xvm/src	54%	0%	➖
pallets/dapp-staking-v3/src	90%	0%	✔
precompiles/sr25519/src	64%	0%	➖
precompiles/xvm/src	75%	0%	➖
pallets/dapp-staking-v3/src/benchmarking	98%	0%	✔
pallets/static-price-provider/src	52%	0%	➖
chain-extensions/types/xvm/src	0%	0%	❌
Summary	77% (3647 / 4717)	0% (0 / 0)	➖

Minimum allowed line rate is 50%