fixed issue where non-admins would get maintenance mode header if maintenance mode was NOT enabled (logic errors, grrr..)

src/middleware/middleware.js

@@ -355,7 +355,7 @@ middleware.renderHeader = function(req, res, callback) {
 			templateValues.user = results.user;
 			templateValues.customCSS = results.customCSS;
 			templateValues.customJS = results.customJS;
-			templateValues.maintenanceHeader = meta.config.maintenanceMode === '1' ^ !!results.isAdmin
+			templateValues.maintenanceHeader = meta.config.maintenanceMode === '1' && !results.isAdmin
 
 			app.render('header', templateValues, callback);
 		});