turn the oft-repeated block_public ... check into a function observer_prohibited()

Zotlabs/Module/Display.php

@@ -7,17 +7,13 @@ class Display extends \Zotlabs\Web\Controller {
 
 	function get($update = 0, $load = false) {
 	
-	//	logger("mod-display: update = $update load = $load");
-	
-	
 		$checkjs = new \Zotlabs\Web\CheckJS(1);
 	
-	
 		if($load)
 			$_SESSION['loadtime'] = datetime_convert();
 	
 	
-		if(intval(get_config('system','block_public')) && (! local_channel()) && (! remote_channel())) {
+		if(observer_prohibited()) {
 			notice( t('Public access denied.') . EOL);
 			return;
 		}