bug5792: removed commented gwt-dev dependency from pom.xml

java/com.sap.sailing.gwt.ui/pom.xml

@@ -20,14 +20,6 @@
       <artifactId>gwt-user</artifactId>
       <version>${gwt.version}</version>
     </dependency>
-    <!-- Is the gwt-dev dependency really required? With Java 11 it created problems because it offers packages otherwise contained in JDK packages now,
-         such as org.xml.sax and javax.xml.parsers.
-    <dependency>
-      <groupId>org.gwtproject</groupId>
-      <artifactId>gwt-dev</artifactId>
-      <version>${gwt.version}</version>
-    </dependency>
-    -->
     <dependency>
       <groupId>javax.validation</groupId>
       <artifactId>validation-api</artifactId>