scripted-diff: Remove unused 'split' parameter to setup_network

-BEGIN VERIFY SCRIPT-
sed -i -e 's/, split=False//g' $(git grep -l 'def setup_network')
-END VERIFY SCRIPT-

test/functional/wallet_dump.py

@@ -94,7 +94,7 @@ class WalletDumpTest(BitcoinTestFramework):
     def skip_test_if_missing_module(self):
         self.skip_if_no_wallet()
 
-    def setup_network(self, split=False):
+    def setup_network(self):
         self.add_nodes(self.num_nodes, extra_args=self.extra_args)
         self.start_nodes()