Remove a check for an unused variable

Left over from a refactoring

https://github.com/nextcloud/server/pull/1940

Signed-off-by: Morris Jobke <hey@morrisjobke.de>

lib/private/Installer.php

@@ -149,9 +149,7 @@ class Installer {
 		}
 
 		//run appinfo/install.php
-		if((!isset($data['noinstall']) or $data['noinstall']==false)) {
 		self::includeAppScript($basedir . '/appinfo/install.php');
-		}
 
 		$appData = OC_App::getAppInfo($appId);
 		OC_App::executeRepairSteps($appId, $appData['repair-steps']['install']);