TF-3260 Load & Display App Grid Linagora Ecosystem

Signed-off-by: dab246 <tdvu@linagora.com>

core/lib/utils/string_convert.dart

@@ -69,4 +69,8 @@ class StringConvert {
       throw const UnsupportedCharsetException();
     }
   }
+
+  static String toUrlScheme(String hostScheme) {
+    return '$hostScheme://';
+  }
 }