dont show config option for file upload size if we cant write the new value

apps/files/admin.php

@@ -51,8 +51,10 @@ $allowZipDownload = intval(OCP\Config::getSystemValue('allowZipDownload', true))
 
 OCP\App::setActiveNavigationEntry( "files_administration" );
 
+$htaccessWritable=is_writable(OC::$SERVERROOT.'/.htaccess');
+
 $tmpl = new OCP\Template( 'files', 'admin' );
-$tmpl->assign( 'htaccessWorking', $htaccessWorking );
+$tmpl->assign( 'uploadChangable', $htaccessWorking and $htaccessWritable );
 $tmpl->assign( 'uploadMaxFilesize', $maxUploadFilesize);
 $tmpl->assign( 'maxPossibleUploadSize', OCP\Util::humanFileSize(PHP_INT_MAX));
 $tmpl->assign( 'allowZipDownload', $allowZipDownload);

apps/files/templates/admin.php

@@ -3,7 +3,7 @@
 <form name="filesForm" action='#' method='post'>
 	<fieldset class="personalblock">
 		<legend><strong><?php echo $l->t('File handling');?></strong></legend>
-		<?php if($_['htaccessWorking']):?>
+		<?php if($_['uploadChangable']):?>
 			<label for="maxUploadSize"><?php echo $l->t( 'Maximum upload size' ); ?> </label><input name='maxUploadSize' id="maxUploadSize" value='<?php echo $_['uploadMaxFilesize'] ?>'/>(<?php echo $l->t('max. possible: '); echo $_['maxPossibleUploadSize'] ?>)<br/>
 		<?php endif;?>
 		<input type="checkbox" name="allowZipDownload" id="allowZipDownload" value="1" title="<?php echo $l->t( 'Needed for multi-file and folder downloads.' ); ?>"<?php if ($_['allowZipDownload']) echo ' checked="checked"'; ?> /> <label for="allowZipDownload"><?php echo $l->t( 'Enable ZIP-download' ); ?></label> <br/>