x11-plugins/pidgin-mbpurple: Proxied maintainer retired

Remove proxied maintainer from metadata as requested per mail.

Closes: https://bugs.gentoo.org/632940
Package-Manager: Portage-2.3.11, Repoman-2.3.3

x11-plugins/pidgin-mbpurple/metadata.xml

@@ -1,14 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
 <pkgmetadata>
-	<maintainer type="person">
-		<email>[email protected]</email>
-		<name>Nils Andresen</name>
-	</maintainer>
-	<maintainer type="project">
-		<email>[email protected]</email>
-		<name>Proxy Maintainers</name>
-	</maintainer>
+<!-- maintainer-needed -->
 	<use>
 		<flag name="twitgin">Enable graphical plugin for Gtk+ interface of Pidgin.</flag>
 	</use>