Save draft on show reference images

app/src/main/java/eu/faircode/email/FragmentCompose.java

@@ -287,6 +287,7 @@ public class FragmentCompose extends FragmentBase {
             @Override
             public void onClick(View v) {
                 show_images = true;
+                onAction(R.id.action_save);
                 showDraft(working);
             }
         });