test: run feature_pruning.py without wallet compiled

Only one small part of the pruning test (sub-test `wallet_test`) is
wallet-related, hence we can run all other parts without wallet compiled.

test/functional/feature_pruning.py

@@ -96,9 +96,6 @@ class PruneTest(BitcoinTestFramework):
         ]
         self.rpc_timeout = 120
 
-    def skip_test_if_missing_module(self):
-        self.skip_if_no_wallet()
-
     def setup_network(self):
         self.setup_nodes()
 
@@ -114,6 +111,7 @@ class PruneTest(BitcoinTestFramework):
     def setup_nodes(self):
         self.add_nodes(self.num_nodes, self.extra_args)
         self.start_nodes()
+        if self.is_wallet_compiled():
             self.import_deterministic_coinbase_privkeys()
 
     def create_big_chain(self):
@@ -474,6 +472,7 @@ class PruneTest(BitcoinTestFramework):
         self.log.info("Test manual pruning with timestamps")
         self.manual_test(4, use_timestamp=True)
 
+        if self.is_wallet_compiled():
             self.log.info("Test wallet re-scan")
             self.wallet_test()