Increase the number of prediction for widgets model

Test: launch all widgets tray and observes widgets predicted.

Bug: 179797520
Change-Id: Id231cde5015a2a79b7532a39343b3340c27e09c9
diff --git a/quickstep/src/com/android/launcher3/model/QuickstepModelDelegate.java b/quickstep/src/com/android/launcher3/model/QuickstepModelDelegate.java
index b1b4d70..df3657d 100644
--- a/quickstep/src/com/android/launcher3/model/QuickstepModelDelegate.java
+++ b/quickstep/src/com/android/launcher3/model/QuickstepModelDelegate.java
@@ -73,6 +73,7 @@
 
     public static final String LAST_PREDICTION_ENABLED_STATE = "last_prediction_enabled_state";
     private static final String LAST_SNAPSHOT_TIME_MILLIS = "LAST_SNAPSHOT_TIME_MILLIS";
+    private static final int NUM_OF_RECOMMENDED_WIDGETS_PREDICATION = 20;
 
     private static final boolean IS_DEBUG = false;
     private static final String TAG = "QuickstepModelDelegate";
@@ -217,7 +218,7 @@
         registerWidgetsPredictor(apm.createAppPredictionSession(
                 new AppPredictionContext.Builder(context)
                         .setUiSurface("widgets")
-                        .setPredictedTargetCount(mIDP.numColumns)
+                        .setPredictedTargetCount(NUM_OF_RECOMMENDED_WIDGETS_PREDICATION)
                         .build()));
     }