Fix parameter count check for importpubkey.

Github-Pull: bitcoin#13507
Rebased-From: 3f72d04

src/wallet/rpcdump.cpp

@@ -432,7 +432,7 @@ UniValue importpubkey(const JSONRPCRequest& request)
         return NullUniValue;
     }
 
-    if (request.fHelp || request.params.size() < 1 || request.params.size() > 4)
+    if (request.fHelp || request.params.size() < 1 || request.params.size() > 3)
         throw std::runtime_error(
             "importpubkey \"pubkey\" ( \"label\" rescan )\n"
             "\nAdds a public key (in hex) that can be watched as if it were in your wallet but cannot be used to spend. Requires a new wallet backup.\n"