Prevent thumbnails from shifting if placeholder view doesn't overlap

Always shift thumbnails when in phone mode.

Bug: 181705607
Test: Placeholder view didn't shift when no thumbnails underneath
it in portrait.

Change-Id: Ib2f066fdf17134b3f5bbd9b465b87868e9ce7583
diff --git a/src/com/android/launcher3/LauncherState.java b/src/com/android/launcher3/LauncherState.java
index 9d50edd..8432f4b 100644
--- a/src/com/android/launcher3/LauncherState.java
+++ b/src/com/android/launcher3/LauncherState.java
@@ -237,10 +237,10 @@
     }
 
     /**
-     * For this state, how much additional vertical translation there should be for each of the
-     * child TaskViews.
+     * For this state, how much additional translation there should be for each of the
+     * child TaskViews. Note that the translation can be its primary or secondary dimension.
      */
-    public float getOverviewSecondaryTranslation(Launcher launcher) {
+    public float getSplitSelectTranslation(Launcher launcher) {
         return 0;
     }