Minor cleanup of Source::guess_language

src/source.cpp

@@ -65,10 +65,10 @@ Glib::RefPtr<Gsv::Language> Source::guess_language(const boost::filesystem::path
       language = language_manager->get_language("meson");
     else if(filename == "Makefile")
       language = language_manager->get_language("makefile");
-    else if(extension == ".tcc")
-      language = language_manager->get_language("cpphdr");
     else if(filename == "Jenkinsfile")
       language = language_manager->get_language("groovy");
+    else if(extension == ".tcc")
+      language = language_manager->get_language("cpphdr");
     else if(extension == ".ts" || extension == ".tsx" || extension == ".jsx" || extension == ".flow")
       language = language_manager->get_language("js");
     else if(extension == ".vert" || // listed on https://github.com/KhronosGroup/glslang