Fix ReportUtils.isMetadata method

Actually, phantom changes of modifyApproverRef and modifyApprovalComment
are not so bad in themselves. They only should not be shown in the audit
report. So we fixed the code used for displaying deltas in reports.

This resolves MID-6213.

model/report-impl/src/main/java/com/evolveum/midpoint/report/impl/ReportUtils.java

@@ -561,16 +561,16 @@ private static String printItemDeltaOldValues(ItemPath itemPath, Collection valu
     }
 
     private static boolean isMetadata(ItemDeltaType itemDelta) {
-        List values = itemDelta.getValue();
-        for (Object v : values) {
-            if (v instanceof MetadataType) {
-                return true;
-            } else if (v instanceof RawType) {
-                return isMetadata(itemDelta.getPath());
+        if (isMetadata(itemDelta.getPath())) {
+            return true;
+        } else {
+            for (Object v : itemDelta.getValue()) {
+                if (v instanceof MetadataType) {
+                    return true;
+                }
             }
+            return false;
         }
-
-        return false;
     }
 
     private static boolean isMetadata(ItemPathType itemPath) {