Fix infinite loop in support flow

The support flow was using `yes` and `no` to mean emergency/not
emergency. But not in all places – in one place it was using
`True`/`False` instead.

We were treating anything other than `yes`/`no` as a non-answer, which
means ask the question again. Because of the `True`/`False` thing, there
was no way of the user providing a valid `yes`/`no` answer. Which means
that we just kept asking them the question again and again and they got
stuck in a loop.

app/main/views/feedback.py

@@ -26,7 +26,7 @@ def triage():
         return redirect(url_for(
             '.feedback',
             ticket_type='problem',
-            severe=(form.severe.data == 'yes')
+            severe=form.severe.data
         ))
     return render_template(
         'views/support/triage.html',