refactor: more convenient error message

When component is not found.

src/context/config.cpp

@@ -373,7 +373,7 @@ struct config : public config_t {
         if(it != component_groups.end()) {
             return it->second;
         }
-        throw error_t(error::component_not_found, "component group {} is missing in config", name);
+        throw error_t(error::component_not_found, "component group `{}` is missing in config", name);
     }
 
     static