test: add add_wallet_options to TestShell

without this, testShell runs with -disablewallet

test/functional/test_framework/test_shell.py

@@ -16,6 +16,9 @@ class TestShell:
     start a single TestShell at a time."""
 
     class __TestShell(BitcoinTestFramework):
+        def add_options(self, parser):
+            self.add_wallet_options(parser)
+
         def set_test_params(self):
             pass