Update shortcut icons according to new accessibility standards

Bug: 152273720
Bug: 152272310
Test: Manual
Change-Id: If9e1c30a27046674cae4189a7cfc6bcfc2e288e9
diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index 0b589a2..31b12ad 100644
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -200,7 +200,7 @@
     <dimen name="system_shortcut_icon_size">24dp</dimen>
     <!-- popup_arrow_center_start - system_shortcut_icon_size / 2 -->
     <dimen name="system_shortcut_margin_start">16dp</dimen>
-    <dimen name="system_shortcut_header_height">40dp</dimen>
+    <dimen name="system_shortcut_header_height">48dp</dimen>
     <dimen name="system_shortcut_header_icon_touch_size">48dp</dimen>
     <!-- (touch_size - icon_size) / 2 -->
     <dimen name="system_shortcut_header_icon_padding">12dp</dimen>