fix: compilation errors in bitcoin#27069 backport

Add missing banman.h include for EnsureBanman functions and fix
SetupDescriptorScriptPubKeyMans call with required parameters.

Fixes compilation failures introduced in 1c0a3d0 (Merge bitcoin#27069:
net: add Ensure{any}Banman).

Author: PastaPastaPasta

src/rpc/server_util.cpp

@@ -4,6 +4,7 @@
 
 #include <rpc/server_util.h>
 
+#include <banman.h>
 #include <net_processing.h>
 #include <node/context.h>
 #include <policy/fees.h>