To get an application other than calculator you need to specify it under <kiosk>, by default this is calculator.
I am surprised /enterprise/user is empty but can you try pushing the attached xml to /enterprise/usr which should bring your device out of kiosk mode:
adb push enterprisehomescreen_disable_kiosk.xml /enterprise/usr/enterprisehomescreen.xml
Same problem here, but adb can't see my device...
Another solution ?