Return mIconLastSetTextAlpha from TEXT_ALPHA property

This was supposed to go in the last CL but I forgot to commit...

Bug: 132455160
Change-Id: Ieb66b1f256d7b14c84bbd4d10af1aa8b073d5ac3

quickstep/recents_ui_overrides/src/com/android/launcher3/appprediction/PredictionRowView.java

@@ -80,7 +80,7 @@ public class PredictionRowView extends LinearLayout implements
 
                 @Override
                 public Integer get(PredictionRowView view) {
-                    return view.mIconCurrentTextAlpha;
+                    return view.mIconLastSetTextAlpha;
                 }
             };