Fix comparisons in the files app

Signed-off-by: Joas Schilling <coding@schilljs.com>

apps/files/ajax/download.php

@@ -51,7 +51,7 @@ if(isset($_GET['downloadStartSecret'])
 	setcookie('ocDownloadStarted', $_GET['downloadStartSecret'], time() + 20, '/');
 }
 
-$server_params = array( 'head' => \OC::$server->getRequest()->getMethod() == 'HEAD' );
+$server_params = array( 'head' => \OC::$server->getRequest()->getMethod() === 'HEAD' );
 
 /**
  * Http range requests support

apps/files/lib/Helper.php

@@ -227,7 +227,7 @@ class Helper {
 
 			foreach ($filesById as $key => $fileWithTags) {
 				foreach($fileList as $key2 => $file){
-					if( $file[$fileIdentifier] == $key){
+					if( $file[$fileIdentifier] === $key){
 						$fileList[$key2] = $fileWithTags;
 					}
 				}

apps/files/lib/Settings/Admin.php

@@ -46,7 +46,7 @@ class Admin implements ISettings {
 	 * @return TemplateResponse
 	 */
 	public function getForm() {
-		$htaccessWorking  = (getenv('htaccessWorking') == 'true');
+		$htaccessWorking  = (getenv('htaccessWorking') === 'true');
 		$htaccessWritable = is_writable(\OC::$SERVERROOT.'/.htaccess');
 		$userIniWritable  = is_writable(\OC::$SERVERROOT.'/.user.ini');