fix(welcome-page) fix .insecure-room-name-warning margin

css/_welcome_page.scss

                     color: $defaultWarningColor;
                     display: flex;
                     flex-direction: row;
-                    margin-top: 5px;
+                    margin-top: 15px;
 
                     .jitsi-icon {
                         margin-right: 15px;