[Bug] Missing "Is function" symbol in "SPF Authentication Failure Reporting"

[sebastiaf]

What happened?
At least one form field on "SPF Authentication Failure Reporting" (/settings/report-dsn/edit) is missing the (x) symbol (at the right end) to signalize the content is expected to be a function and not a plain string.

How can we reproduce the problem?
Settings -> Reports -> SPF

Version
v0.15.x

What database are you using?
PostgreSQL

What blob storage are you using?
Filesystem

Where is your directory located?
Internal

What operating system are you using?
Linux