nrf52_bsim: Fix typo in warning message
nrf52_bsim: Fix typo in warning message

Fixed a typo in the warning message printed when the user does not
pass any parameters (and therefore does not connect to a BabbleSim
Phy)

Signed-off-by: Alberto Escolar Piedras <52be3174920ed06cbdfbcf9622a1a6c68e942617@oticon.com>

punitvara/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,ldts/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,finikorg/zephyr,nashif/zephyr,Vudentz/zephyr,explora26/zephyr,nashif/zephyr,explora26/zephyr,galak/zephyr,finikorg/zephyr,punitvara/zephyr,galak/zephyr,finikorg/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,explora26/zephyr,explora26/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,punitvara/zephyr,nashif/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,ldts/zephyr,ldts/zephyr,nashif/zephyr,punitvara/zephyr,explora26/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr