Remove devname identifier from autogenerated RPC code

Patch 79cf07af missed one instance of "devname" in source for RPC code
generator.

src/remote/remote_protocol.x

@@ -2102,7 +2102,7 @@ struct remote_domain_snapshot_delete_args {
 
 struct remote_domain_open_console_args {
     remote_nonnull_domain dom;
-    remote_string devname;
+    remote_string dev_name;
     unsigned int flags;
 };
 

src/remote_protocol-structs

@@ -1585,7 +1585,7 @@ struct remote_domain_snapshot_delete_args {
 };
 struct remote_domain_open_console_args {
         remote_nonnull_domain      dom;
-        remote_string              devname;
+        remote_string              dev_name;
         u_int                      flags;
 };
 struct remote_storage_vol_upload_args {