Removing TODO since bug is unfeasible.

The QSLongPressEffect is tailored to each tile's own state when it comes
to touch handling and the long-press animation. Making the class a
singleton could introduce more difficulties (complex touch handling,
and state management) than benefits.

Test: presubmit
Flag: com.android.systemui.quick_settings_visual_haptics_longpress
Bug: 332902869
Change-Id: I6c1e30b05aee27f530ec2c4f0ab3dd2a686feb4b