bluetooth: common: remove Enable from BT_HCI_VS_FATAL_ERROR prompt
bluetooth: common: remove Enable from BT_HCI_VS_FATAL_ERROR prompt

Boolean options are not allowed to start with "Enable...".
BT_HCI_VS_FATAL_ERROR started with "Enable..." making some PRs fail due
to compliance checks.

Signed-off-by: Gerard Marull-Paretas <bedb45f43a286e49f4dcda039a436b216ae61ef3@nordicsemi.no>

finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr