*/*: remove proxied="yes" from metadata.xml

GURU don't have proxied maintainers.
Also remove two instances where proxy-maint was referenced

Signed-off-by: David Roman <davidroman96@gmail.com>

net-p2p/dogecoin-qt/metadata.xml

@@ -7,7 +7,7 @@
 		<doc>https://github.com/dogecoin/dogecoin/tree/master/doc</doc>
 		<remote-id type="github">dogecoin/dogecoin</remote-id>
 	</upstream>
-	<maintainer type="person" proxied="yes">
+	<maintainer type="person">
 		<email>victor3.14@yandex.com</email>
 		<name>Victor Skovorodnikov</name>
 	</maintainer>

net-p2p/monero-gui-bin/metadata.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
 <pkgmetadata>
-  <maintainer type="person" proxied="yes">
+  <maintainer type="person">
     <email>justin026@protonmail.com</email>
     <name>Justin Donofrio</name>
   </maintainer>