Revert "Update onOverviewShown interface to get signal of whethe..."

Revert submission 20956764-alt_tab_forward

Reason for revert: Actually we dont need these changes after all. SHIFT doesn't matter in the initial tab to overview. The subsequent tabs are handled by RecentsView and we already have a check on shift

Reverted changes: /q/submissionid:20956764-alt_tab_forward

Change-Id: I42b03d10f30ef137c98005bb46e23f8516720236
diff --git a/quickstep/src/com/android/quickstep/TouchInteractionService.java b/quickstep/src/com/android/quickstep/TouchInteractionService.java
index 4a0a4e8..ffeadcd 100644
--- a/quickstep/src/com/android/quickstep/TouchInteractionService.java
+++ b/quickstep/src/com/android/quickstep/TouchInteractionService.java
@@ -197,7 +197,7 @@
 
         @BinderThread
         @Override
-        public void onOverviewShown(boolean triggeredFromAltTab, boolean forward) {
+        public void onOverviewShown(boolean triggeredFromAltTab) {
             if (triggeredFromAltTab) {
                 TaskUtils.closeSystemWindowsAsync(CLOSE_SYSTEM_WINDOWS_REASON_RECENTS);
                 mOverviewCommandHelper.addCommand(OverviewCommandHelper.TYPE_SHOW_NEXT_FOCUS);