Re-enable the testDragCustomShortcut test in pre-submits

In follow up need to align the code that looks for widets to work for
two pane picker in tablets.

Bug: 322820039
Flag: N/A
Test: Presubmit enabled for test
Change-Id: If8a3a7867bbafd5a08ebaef6ed354105762a8a23
diff --git a/tests/src/com/android/launcher3/ui/widget/TaplAddWidgetTest.java b/tests/src/com/android/launcher3/ui/widget/TaplAddWidgetTest.java
index 7845dec..9dbd866 100644
--- a/tests/src/com/android/launcher3/ui/widget/TaplAddWidgetTest.java
+++ b/tests/src/com/android/launcher3/ui/widget/TaplAddWidgetTest.java
@@ -86,7 +86,6 @@
      * A custom shortcut is a 1x1 widget that launches a specific intent when user tap on it.
      * Custom shortcuts are replaced by deep shortcuts after api 25.
      */
-    @Stability(flavors = LOCAL | PLATFORM_POSTSUBMIT)
     @Test
     @PortraitLandscape
     public void testDragCustomShortcut() throws Throwable {