test: use MiniWallet for rpc_createmultisig.py

This test can now be run even with the Bitcoin Core wallet disabled.

test/functional/test_runner.py

@@ -225,8 +225,7 @@ BASE_SCRIPTS = [
     'feature_rbf.py --descriptors',
     'mempool_packages.py',
     'mempool_package_onemore.py',
-    'rpc_createmultisig.py --legacy-wallet',
-    'rpc_createmultisig.py --descriptors',
+    'rpc_createmultisig.py',
     'rpc_packages.py',
     'mempool_package_limits.py',
     'feature_versionbits_warning.py',