Re-implement ordered_map::erase,

so that it can handle pair<const Key,...>

include/nlohmann/json.hpp

@@ -499,9 +499,9 @@ class basic_json
           // Note the use of std::map default allocator as a placeholder
           // to extract the actual ObjectType::value_type
           AllocatorType<typename
-            ObjectType<StringType,basic_json,object_comparator_t,
-                std::allocator<std::pair<const StringType, basic_json>>
-                    >::value_type>>;
+          ObjectType<StringType, basic_json, object_comparator_t,
+          std::allocator<std::pair<const StringType, basic_json>>
+          >::value_type>>;
 
     /*!
     @brief a type for an array