Bluetooth: Mesh: Fix encoding health status when app has no callback
Bluetooth: Mesh: Fix encoding health status when app has no callback

The branch for handling the case when the app has not provided a
callback for health faults was encoding the payload in a wrong way.

Signed-off-by: Johan Hedberg <628991c7b0a19c384f9b99c21ec330ce952bb838@intel.com>

explora26/zephyr,fbsder/zephyr,zephyriot/zephyr,ldts/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,galak/zephyr,ldts/zephyr,aceofall/zephyr-iotos,mbolivar/zephyr,zephyriot/zephyr,mbolivar/zephyr,fbsder/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyriot/zephyr,aceofall/zephyr-iotos,fbsder/zephyr,mbolivar/zephyr,aceofall/zephyr-iotos,zephyriot/zephyr,galak/zephyr,nashif/zephyr,galak/zephyr,ldts/zephyr,explora26/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,mbolivar/zephyr,ldts/zephyr,Vudentz/zephyr,explora26/zephyr,Vudentz/zephyr,finikorg/zephyr,ldts/zephyr,punitvara/zephyr,Vudentz/zephyr,nashif/zephyr,kraj/zephyr,fbsder/zephyr,fbsder/zephyr,nashif/zephyr,kraj/zephyr,kraj/zephyr,finikorg/zephyr,nashif/zephyr,explora26/zephyr,explora26/zephyr,kraj/zephyr,GiulianoFranchetto/zephyr,finikorg/zephyr,aceofall/zephyr-iotos,punitvara/zephyr,mbolivar/zephyr,nashif/zephyr,zephyriot/zephyr,galak/zephyr,GiulianoFranchetto/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,finikorg/zephyr,kraj/zephyr,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,aceofall/zephyr-iotos,finikorg/zephyr,punitvara/zephyr