Contacts: Add configChanges attribute in manifest file

When rotate the screen, the ContactEditorActivity call oncreate() again,
so the dialog will dismiss.

Add android:configChanges="orientation|screenSize" in manifest file
to prevent onCreate function from being recalled.

CRs-Fixed: 672421

Change-Id: I7901ab5bfb93dd78ceca76111c8a86f95447c908