Tune taskbar handle height

Bug: 200310506
Test: https://screenshot.googleplex.com/B2Ugt2GGahxgm5m
Change-Id: Id639250e4cbcc8750436913c27567cf29dd0de04
diff --git a/quickstep/res/values/dimens.xml b/quickstep/res/values/dimens.xml
index 3b2d44b..1ee7743 100644
--- a/quickstep/res/values/dimens.xml
+++ b/quickstep/res/values/dimens.xml
@@ -227,7 +227,7 @@
     <dimen name="taskbar_contextual_buttons_size">35dp</dimen>
     <dimen name="taskbar_stashed_size">24dp</dimen>
     <dimen name="taskbar_stashed_handle_width">220dp</dimen>
-    <dimen name="taskbar_stashed_handle_height">6dp</dimen>
+    <dimen name="taskbar_stashed_handle_height">4dp</dimen>
     <dimen name="taskbar_edu_wave_anim_trans_y">25dp</dimen>
     <dimen name="taskbar_edu_wave_anim_trans_y_return_overshoot">4dp</dimen>
 </resources>