Move 'dismiss prediction' to droptarget

This is done to avoid shortcuts being crowded when a predicted app is
long pressed.

Bug: 148707493
Test: Manual
Change-Id: I356a2cebfcc329478d96ee815fd641179359a572
diff --git a/res/values/config.xml b/res/values/config.xml
index 0945642..ef34dcd 100644
--- a/res/values/config.xml
+++ b/res/values/config.xml
@@ -108,6 +108,7 @@
     <item type="id" name="action_shortcuts_and_notifications"/>
     <item type="id" name="action_dismiss_notification" />
     <item type="id" name="action_remote_action_shortcut" />
+    <item type="id" name="action_dismiss_prediction" />
 
     <!-- QSB IDs. DO not change -->
     <item type="id" name="search_container_workspace" />