Update dbl_list codegen

codegen/dbl_list/snippets/list_pop_front

@@ -1,4 +1,4 @@
-  {Ttitle}Node *output = NULL;
+  {NodeType} *output = NULL;
 
   if (!list || list->node_count == 0) {{
     goto RETURN_{Tupper}_LIST_POP_FRONT;
@@ -7,7 +7,7 @@
   output = list->first;
 
   if (list->node_count == 1) {{
-    *list = ({Ttitle}List){{0}};
+    *list = ({ListType}){{0}};
     goto RETURN_{Tupper}_LIST_POP_FRONT;
   }}