Modernize source code: last part (#6285)

* Modernize source code: last par

* Use empty when needed
* Use emplace_back instead of push_back when needed
* For range-based loops
* Initializers fixes
* constructors, destructors default
* c++ C stl includes

src/chat.cpp

@@ -365,8 +365,8 @@ s32 ChatBuffer::getBottomScrollPos() const
 	s32 rows = (s32) m_rows;
 	if (rows == 0)
 		return 0;
-	else
-		return formatted_count - rows;
+
+	return formatted_count - rows;
 }