Classpath calculation wrong for binary annotations

During classId validation the classpath calculation was wrong for binary
annotations because they are no IMember.

org.eclipse.scout.sdk.s2e/src/main/java/org/eclipse/scout/sdk/s2e/util/S2eUtils.java

@@ -582,27 +582,9 @@ public static boolean exists(IJavaElement element) {
    * @return <code>true</code> if element was found in the classpath of project, <code>false</code> otherwise.
    */
   public static boolean isOnClasspath(IJavaElement element, IJavaProject project) {
-    if (!exists(element)) {
+    if (!exists(element) || !exists(project)) {
       return false;
     }
-    if (!exists(project)) {
-      return false;
-    }
-
-    if (element instanceof IMember) {
-      IMember member = (IMember) element;
-      if (member.isBinary()) {
-        return project.isOnClasspath(member);
-      }
-    }
-
-    IJavaProject elemenProject = element.getJavaProject();
-    if (elemenProject != null) {
-      if (project.equals(elemenProject)) {
-        return true;
-      }
-      return project.isOnClasspath(elemenProject);
-    }
     return project.isOnClasspath(element);
   }