media-sound/sc2mpd: Remove useless maintainer <description/>

Remove useless/redundant maintainer <description/>. It does not benefit
bug wrangling, and only wastes developer's time on reading it. Few tips:

- assignee/CC is implied by ordering, there is no reason to repeat it,
- we know that maintainer is maintainer (la la la la la),
- most of adjectives for maintainer are of no value and/or are obvious.

media-sound/sc2mpd/metadata.xml

@@ -3,7 +3,6 @@
 <pkgmetadata>
 <maintainer type="person">
  <email>[email protected]</email>
- <description>Primary maintainer</description>
 </maintainer>
 <longdescription>Implements the SongCast protocol for use by upmpdcli and mpd</longdescription>
 </pkgmetadata>