GUAC-586: Username header should respect case.

guacamole/src/main/webapp/app/manage/styles/manage-user.css

@@ -23,3 +23,7 @@
 .manage-user .username.header {
     margin-bottom: 0;
 }
+
+.manage-user .username.header h2 {
+    text-transform: none;
+}