test: Make requires_wallet private

The bool is only used to call a public helper, which some tests already
do. So use the public helper in all tests consistently and make the
confusingly named bool private.

test/functional/rpc_rawtransaction.py

@@ -65,8 +65,6 @@ class RawTransactionsTest(BitcoinTestFramework):
         # whitelist all peers to speed up tx relay / mempool sync
         for args in self.extra_args:
             args.append("-whitelist=noban@127.0.0.1")
-        self.requires_wallet = self.is_specified_wallet_compiled()
-
         self.supports_cli = False
 
     def setup_network(self):
@@ -85,7 +83,8 @@ class RawTransactionsTest(BitcoinTestFramework):
         self.sendrawtransaction_testmempoolaccept_tests()
         self.decoderawtransaction_tests()
         self.transaction_version_number_tests()
-        if self.requires_wallet and not self.options.descriptors:
+        if self.is_specified_wallet_compiled() and not self.options.descriptors:
+            self.import_deterministic_coinbase_privkeys()
             self.raw_multisig_transaction_legacy_tests()
 
     def getrawtransaction_tests(self):