Fix mobile avatars

server/startup/avatar.js

@@ -18,6 +18,8 @@ Meteor.startup(function() {
 			let username = decodeURIComponent(match[1]);
 			let file;
 
+			username = username.replace(/\.jpg$/, '');
+
 			if (username[0] !== '@') {
 				if (Meteor.settings && Meteor.settings.public && Meteor.settings.public.sandstorm) {
 					const user = RocketChat.models.Users.findOneByUsername(username);