Fix typo in 04-flex solution: extra semicolon

Author: Satika Jayawardena

flex/04-flex-information/solution/solution.css

@@ -20,7 +20,7 @@ img {
   right: 0;
   height: 52px;
   display: flex;
-  align-items: center;;
+  align-items: center;
   justify-content: center;
   background: #eee;
 }