No need to override the isImeEnabledOnSwipeUp flag in Launcher3.

It's only used in NexusLauncher now.

Bug: 262729669
Test: manual
Change-Id: Ic145d7ad007ec314974713b6c4bf880d55607cf7

src/com/android/launcher3/allapps/BaseSearchConfig.java

@@ -25,11 +25,4 @@ public class BaseSearchConfig {
     public boolean isKeyboardSyncEnabled() {
         return false;
     }
-
-    /**
-     * Returns whether IME is enabled on swipe up.
-     */
-    public boolean isImeEnabledOnSwipeUp() {
-        return false;
-    }
 }