Revert "*/*: remove invalid maintainer address"

This reverts commit 4429a5b650.
The user registered the e-mail in bugzilla, it should be fine now.

Signed-off-by: Viorel Munteanu <ceamac@gentoo.org>

acct-user/uinput-proxy/metadata.xml

@@ -1,5 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
 <pkgmetadata>
-	<!-- maintainer-needed -->
+	<maintainer type="person">
+		<email>trantiendat29042005@gmail.com</email>
+		<name>Trần Tiến Đạt</name>
+	</maintainer>
 </pkgmetadata>