[Large screen] SplitListener may not provide correct information

SettingsActivity may send Settings 2-pane deep link Intent to
SettingsHomepageActivity if split callback tells that there is no
SplitInfo.

Wallpaper app sends deep link Intent to SettingsHomepageActivity,
and then SettingsHomepageActivity starts Wallpaper app page.
The flow should be 2-pane organized but the split callback tells
that splitInfos is empty.

This change checks if the Intent is from SettingsHomepageActivity
to prevent the Intent loop by the bug.

Bug: 205206004
Test: manual
      Long click Launcher -> Wallpaper & style
Change-Id: I6b9d76c136238e556384e891ae1700ae7c1bb41f