test: create default wallet in extended tests

This was omitted from #15454

test/functional/feature_dbcrash.py

@@ -56,7 +56,7 @@ class ChainstateWriteCrashTest(BitcoinTestFramework):
         # Set -maxmempool=0 to turn off mempool memory sharing with dbcache
         # Set -rpcservertimeout=900 to reduce socket disconnects in this
         # long-running test
-        self.base_args = ["-limitdescendantsize=0", "-maxmempool=0", "-rpcservertimeout=900", "-dbbatchsize=200000"]
+        self.base_args = ["-limitdescendantsize=0", "-maxmempool=0", "-rpcservertimeout=900", "-dbbatchsize=200000", "-wallet="]
 
         # Set different crash ratios and cache sizes.  Note that not all of
         # -dbcache goes to the in-memory coins cache.
@@ -66,7 +66,7 @@ class ChainstateWriteCrashTest(BitcoinTestFramework):
 
         # Node3 is a normal node with default args, except will mine full blocks
         # and non-standard txs (e.g. txs with "dust" outputs)
-        self.node3_args = ["-blockmaxweight=4000000", "-acceptnonstdtxn"]
+        self.node3_args = ["-blockmaxweight=4000000", "-acceptnonstdtxn", "-wallet="]
         self.extra_args = [self.node0_args, self.node1_args, self.node2_args, self.node3_args]
 
     def skip_test_if_missing_module(self):

test/functional/feature_pruning.py

@@ -81,16 +81,16 @@ class PruneTest(BitcoinTestFramework):
 
         # Create nodes 0 and 1 to mine.
         # Create node 2 to test pruning.
-        self.full_node_default_args = ["-maxreceivebuffer=20000", "-checkblocks=5"]
+        self.full_node_default_args = ["-maxreceivebuffer=20000", "-checkblocks=5", "-wallet="]
         # Create nodes 3 and 4 to test manual pruning (they will be re-started with manual pruning later)
         # Create nodes 5 to test wallet in prune mode, but do not connect
         self.extra_args = [
             self.full_node_default_args,
             self.full_node_default_args,
-            ["-maxreceivebuffer=20000", "-prune=550"],
-            ["-maxreceivebuffer=20000"],
-            ["-maxreceivebuffer=20000"],
-            ["-prune=550"],
+            ["-wallet=", "-maxreceivebuffer=20000", "-prune=550"],
+            ["-wallet=", "-maxreceivebuffer=20000"],
+            ["-wallet=", "-maxreceivebuffer=20000"],
+            ["-wallet=", "-prune=550"],
         ]
         self.rpc_timeout = 120