dev-util/sysprof: Switch maintenance to gnome@ as primary

sysprof is an optional dependency of gnome-builder and its previous
maintainers are all part of that. Given that gnome-builder is maintained
by gnome team, move sysprof to be maintained primarily by gnome@ as well.
Remove myself by name in the process, keep tetromino for now as he's not
me, and no need to remove at least an explicit CC unless he wants that.

Package-Manager: Portage-2.3.19, Repoman-2.3.6

dev-util/sysprof/metadata.xml

@@ -1,14 +1,14 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
 <pkgmetadata>
+<maintainer type="project">
+	<email>[email protected]</email>
+	<name>Gentoo GNOME Desktop</name>
+</maintainer>
 <maintainer type="person">
 	<email>[email protected]</email>
 	<name>Alexandre Rostovtsev</name>
 </maintainer>
-<maintainer type="person">
-	<email>[email protected]</email>
-	<name>Mart Raudsepp</name>
-</maintainer>
 <longdescription lang="en">
 	Sysprof is a sampling CPU profiler for Linux that profiles the entire system,
 	not just a single application.