tests: net: socket: tls: Fix test_v4_dtls_sendmsg test case
tests: net: socket: tls: Fix test_v4_dtls_sendmsg test case

test_v4_dtls_sendmsg test case wrongly used IPv6 socket instead of IPv4.

Signed-off-by: Robert Lubos <9d28997c6894a2d0321a7bb399169af7ce99b64e@nordicsemi.no>

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