views/alert_words.py: Use `do_add_alert_words()` in `add_alert_words()`.
views/alert_words.py: Use `do_add_alert_words()` in `add_alert_words()`.

Revert to the use of `do_add_alert_words()` in `add_alert_words()`
instead of `do_set_alert_words()` since it is used for serving a
PUT request. This change seems to be mistakenly done in commit
`d564a76f8e45b24cd2c66475ef7693582fb2f5fc'.

mahim97/zulip,Galexrt/zulip,vaidap/zulip,vabs22/zulip,synicalsyntax/zulip,verma-varsha/zulip,kou/zulip,rht/zulip,kou/zulip,mahim97/zulip,rishig/zulip,zulip/zulip,dhcrzf/zulip,brockwhittaker/zulip,vabs22/zulip,andersk/zulip,andersk/zulip,synicalsyntax/zulip,brainwane/zulip,kou/zulip,vabs22/zulip,dhcrzf/zulip,vaidap/zulip,tommyip/zulip,punchagan/zulip,brainwane/zulip,shubhamdhama/zulip,hackerkid/zulip,timabbott/zulip,timabbott/zulip,jackrzhang/zulip,zulip/zulip,dhcrzf/zulip,synicalsyntax/zulip,brockwhittaker/zulip,andersk/zulip,hackerkid/zulip,brainwane/zulip,rht/zulip,dhcrzf/zulip,dhcrzf/zulip,dhcrzf/zulip,synicalsyntax/zulip,mahim97/zulip,vaidap/zulip,shubhamdhama/zulip,eeshangarg/zulip,verma-varsha/zulip,eeshangarg/zulip,jrowan/zulip,vabs22/zulip,showell/zulip,andersk/zulip,vaidap/zulip,rishig/zulip,Galexrt/zulip,jackrzhang/zulip,zulip/zulip,brainwane/zulip,eeshangarg/zulip,mahim97/zulip,tommyip/zulip,showell/zulip,amanharitsh123/zulip,timabbott/zulip,zulip/zulip,zulip/zulip,kou/zulip,tommyip/zulip,synicalsyntax/zulip,jrowan/zulip,rishig/zulip,showell/zulip,kou/zulip,dhcrzf/zulip,shubhamdhama/zulip,Galexrt/zulip,verma-varsha/zulip,andersk/zulip,amanharitsh123/zulip,shubhamdhama/zulip,brockwhittaker/zulip,showell/zulip,eeshangarg/zulip,rht/zulip,tommyip/zulip,amanharitsh123/zulip,Galexrt/zulip,jrowan/zulip,tommyip/zulip,Galexrt/zulip,Galexrt/zulip,punchagan/zulip,brainwane/zulip,amanharitsh123/zulip,timabbott/zulip,amanharitsh123/zulip,punchagan/zulip,jackrzhang/zulip,eeshangarg/zulip,brainwane/zulip,eeshangarg/zulip,mahim97/zulip,punchagan/zulip,jackrzhang/zulip,synicalsyntax/zulip,jrowan/zulip,rht/zulip,Galexrt/zulip,rishig/zulip,brockwhittaker/zulip,eeshangarg/zulip,hackerkid/zulip,vaidap/zulip,shubhamdhama/zulip,vabs22/zulip,brockwhittaker/zulip,tommyip/zulip,jackrzhang/zulip,shubhamdhama/zulip,rht/zulip,punchagan/zulip,verma-varsha/zulip,rishig/zulip,hackerkid/zulip,timabbott/zulip,rht/zulip,hackerkid/zulip,zulip/zulip,rishig/zulip,tommyip/zulip,zulip/zulip,timabbott/zulip,verma-varsha/zulip,punchagan/zulip,vaidap/zulip,jackrzhang/zulip,jackrzhang/zulip,jrowan/zulip,hackerkid/zulip,rht/zulip,jrowan/zulip,kou/zulip,showell/zulip,amanharitsh123/zulip,kou/zulip,andersk/zulip,shubhamdhama/zulip,mahim97/zulip,verma-varsha/zulip,hackerkid/zulip,rishig/zulip,punchagan/zulip,showell/zulip,synicalsyntax/zulip,andersk/zulip,brainwane/zulip,vabs22/zulip,showell/zulip,brockwhittaker/zulip,timabbott/zulip