net: l2: wifi: Fix Print of SSID in WIFI status

While printing SSID in wifi status command, If the
length is maximum(32 character). It leads to buffer
overflow. It required one character for null
terminator ‘\0’. Changing the Format Specifiers to
print proper SSID.

Signed-off-by: Kapil Bhatt <kapil.bhatt@nordicsemi.no>