Show failed minify file and fix username editing privilege (#6445)

* Fix global mods and admins being unable to change usernames

* Message file which failed to minify

src/meta/minifier.js

@@ -234,7 +234,7 @@ function minifyAndSave(data, callback) {
 	});
 
 	if (minified.error) {
-		return callback(minified.error);
+		return callback({ stack: 'Error minifying ' + minified.error.filename + '\n' + minified.error.stack });
 	}
 
 	async.parallel([

src/socket.io/user/profile.js

@@ -90,7 +90,7 @@ module.exports = function (SocketUser) {
 					return next(new Error('[[error:no-privileges]]'));
 				}
 
-				if ((!results.isAdmin || !results.isGlobalMod) && !isSelf) {
+				if (!isSelf && !(results.isAdmin || results.isGlobalMod)) {
 					return next(new Error('[[error:no-privileges]]'));
 				}