Added stylus tool to selection tracker

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

@@ -1206,6 +1206,7 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                     new ItemDetailsLookupMessage(rvMessage),
                     StorageStrategy.createLongStorage())
                     .withSelectionPredicate(selectionPredicate)
+                    .withPointerTooltypes(MotionEvent.TOOL_TYPE_MOUSE, MotionEvent.TOOL_TYPE_STYLUS)
                     .build();
             adapter.setSelectionTracker(selectionTracker);