[Market] Cut all pledge won't remove lock

[badkk]

Due to the set_lock mechanism in Currency module, if set_lock(0), it won't work, we should call remove_lock referring to unbond in staking module

crust/cstrml/staking/src/lib.rs

Lines 830 to 840 in 77453d0

	if ledger.unlocking.is_empty() && ledger.active.is_zero() {
	// This account must have called `unbond()` with some value that caused the active
	// portion to fall below existential deposit + will have no more unlocking chunks
	// left. We can now safely remove all staking-related information.
	Self::kill_stash(&stash);
	// remove the lock.
	T::Currency::remove_lock(STAKING_ID, &stash);
	} else {
	// This was the consequence of a partial unbond. just update the ledger and move on.
	Self::update_ledger(&controller, &ledger);
	}