samples: net: wifi: Remove sleep K_FOREVER, which asserts.
samples: net: wifi: Remove sleep K_FOREVER, which asserts.

The wifi shell sample asserts when trying to do a sleep
forever.

The sleep should not be necessary, so removing it.

Signed-off-by: Gil Pitney <477da50908f0a7963c2c490cce0ff096d2cac162@linaro.org>

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