Move no-0-rent rent dist. behavior under feature (#12804)

runtime/src/bank.rs

@@ -2676,7 +2676,7 @@ impl Bank {
                 } else {
                     rent_share
                 };
-                if rent_to_be_paid > 0 {
+                if !enforce_fix || rent_to_be_paid > 0 {
                     let mut account = self.get_account(&pubkey).unwrap_or_default();
                     account.lamports += rent_to_be_paid;
                     self.store_account(&pubkey, &account);