Prevent unnecessary connector been created in fallback connection.

Separate the && condition to prevent create unnecessary connector in
fallback connection.

Fix: 123104622
Test: connect on secondary display and change wallpapers, check log and
use dumpsys to ensure there is no unnecessary ImageWallpaper been
created.

Change-Id: I6ffd833b9e544db5ccb3f68aba28f6bfc4ac15fd