BUGFIX Check for existance of IIS rewrite module as a value that exis…

…ts instead of being "1" (from r98031)

git-svn-id: svn://svn.silverstripe.com/silverstripe/open/phpinstaller/trunk@112092 467b73ca-7a2a-4603-9d3b-597d59a354a9

install.php

@@ -532,7 +532,7 @@ function requireApacheModule($moduleName, $testDetails) {
 
 	function requireIISRewriteModule($moduleName, $testDetails) {
 		$this->testing($testDetails);
-		if(isset($_SERVER[$moduleName]) && $_SERVER[$moduleName] == 1) {
+		if(isset($_SERVER[$moduleName]) && $_SERVER[$moduleName]) {
 			return true;
 		} else {
 			$this->error($testDetails);