Improve sendShiftDownEvent statement grouping

Author: yawnoc

app/src/main/java/io/github/yawnoc/strokeinput/InputContainer.java

@@ -570,8 +570,8 @@ private void sendShiftDownEvent(final int pointerId) {
           : SHIFT_HELD
       );
     }
-    
     shiftPointerId = pointerId;
+    
     invalidate();
   }