Revert "Remove FLAG_ACTIVITY_FORWARD_RESULT in 2-pane flow"

This reverts commit ea1580f92b.

Reason for revert:
1. Search result trampoline should have that result sent back to the
reply target of the original activity.
2. To leverage the behavior of handheld's deep link case, large
screen's deep link should forward the result.

Change-Id: I55303070e35fc9430063655e0a9a0fd72e0823ac

src/com/android/settings/SettingsActivity.java

@@ -415,6 +415,7 @@ public class SettingsActivity extends SettingsBaseActivity
 
         trampolineIntent.putExtra(EXTRA_SETTINGS_EMBEDDED_DEEP_LINK_HIGHLIGHT_MENU_KEY,
                 highlightMenuKey);
+        trampolineIntent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
         return trampolineIntent;
     }