build: fix triggers branch target back to ES2019 (#3480)
build: fix triggers branch target back to ES2019 (#3480)

This was broken in #3315 when the config files were split up.
Even though babel is used with webpack, babel is not used for
the triggers branch which is referenced directly by users
who are writing their own triggers.
quisquous/cactbot,quisquous/cactbot,quisquous/cactbot,quisquous/cactbot,quisquous/cactbot,quisquous/cactbot