Remove a tag that is no longer emitted. (!MR 112)

Together with Dh-Compat-Level: 12 in 'desc', the default builder
supplies the correct dependency via:

Default-Build-Depends: debhelper (>= {$dh_compat_level}~)

The tag complaining about lack of a version is no longer issued.
Removing it from the list of expected tags.

Signed-off-by: Chris Lamb <lamby@debian.org>