Fix typo `event.int_ext` (was switched around) leading to table update notifications not received

display-driver.lua

-if event.punch or event.int or event.int_ext or (event.digiline and event.channel == "station_update") then
+if event.punch or event.int or event.ext_int or (event.digiline and event.channel == "station_update") then
 
 local unique_terminal_identifier = "RZ.CODE display1"
 local lcds = {"public_lcd1", "public_lcd2", "public_lcd3", "public_lcd4"}