Update custom xref query

rebar.config

@@ -16,5 +16,5 @@
       - (\"erlydtl\":\"compile\"/\"3\")
       - (\"lfe_comp\":\"file\"/\"2\")
       - (\"neotoma\":\"file\"/\"2\")
-      - (\"protobuffs_compile\":\"scan_file\"/\"1\"))",
+      - (\"protobuffs_compile\":\"scan_file\"/\"2\"))",
          []}]}.