media-video/obs-studio: Remove proxy-maint

Remove proxy maintainer project from metadata, because there was no
proxied maintainer left.
Reported-By: Michael Mair-Keimberger
Package-Manager: Portage-2.3.11, Repoman-2.3.3

media-video/obs-studio/metadata.xml

@@ -5,10 +5,6 @@
  <email>[email protected]</email>
  <name>Jimi Huotari</name>
  </maintainer>
- <maintainer type="project">
- <email>[email protected]</email>
- <name>Proxy Maintainers</name>
- </maintainer>
  <longdescription>
  A rewrite of what was formerly known as "Open Broadcaster Software",
  software originally designed for recording and streaming live video