fix(): back to dashboard link fix

public/app/features/dashboard/dashnav/dashnav.html

@@ -70,7 +70,7 @@
 </ul>
 
 <ul class="nav pull-right">
-	<li ng-show="dashboardViewState.fullscreen" class="back-to-dashboard-link">
+	<li ng-show="dashboard.meta.fullscreen" class="back-to-dashboard-link">
 		<a ng-click="exitFullscreen()">
 			Back to dashboard
 		</a>