Remove extra semi colon from squangle/mysql_client/Row.cpp

Summary:
`-Wextra-semi` or `-Wextra-semi-stmt`

If the code compiles, this is safe to land.

Reviewed By: dmm-fb

Differential Revision: D51777911

fbshipit-source-id: bcfd46ade9c05669a1cb9afbb7b9e172200f667d

squangle/mysql_client/Row.cpp

@@ -263,7 +263,7 @@ std::chrono::system_clock::time_point parseDateTime(
       break;
     default:
       break;
-  };
+  }
 
   if (!parse_succeeded) {
     throw std::range_error("Can't parse date");