app-shells/fish: 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.

app-shells/fish/metadata.xml

@@ -4,11 +4,9 @@
  <maintainer type="person">
  <email>[email protected]</email>
  <name>Georgy Yakovlev</name>
- <description>Proxied maintainer. Please assign bugs to him.</description>
  </maintainer>
  <maintainer type="person">
  <email>[email protected]</email>
  <name>Lars Wendler</name>
- <description>Proxy maintainer of Georgy. Please CC on bugs.</description>
  </maintainer>
 </pkgmetadata>