Fix correct save button enablement in metadata (#630)

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

hawkbit-ui/src/main/java/org/eclipse/hawkbit/ui/common/AbstractMetadataPopupLayout.java

@@ -502,6 +502,7 @@ public abstract class AbstractMetadataPopupLayout<E extends NamedVersionedEntity
 
     private void setUpDetails(final Long swId, final String metaDatakey) {
         resetDetails();
+        metadataWindow.clearOriginalValues();
         if (swId != null) {
             metaDataGrid.getContainerDataSource().removeAllItems();
             populateGrid();