esphttpd: increase stack size for task wsbcast
esphttpd: increase stack size for task wsbcast

Seeing stack overflows on this one.

ourairquality/esp-open-rtos,ourairquality/esp-open-rtos,ourairquality/esp-open-rtos,ourairquality/esp-open-rtos,ourairquality/esp-open-rtos,ourairquality/esp-open-rtos