removed redundant whitespace

tests/unit/framework/helpers/FileHelperTest.php

@@ -348,7 +348,7 @@ class FileHelperTest extends TestCase
         $file = $this->testFilePath . DIRECTORY_SEPARATOR . 'mime_type_test.txt';
         file_put_contents($file, 'some text');
         $this->assertEquals('text/plain', FileHelper::getMimeType($file));
-		
+
         // see http://stackoverflow.com/questions/477816/what-is-the-correct-json-content-type
         // JSON/JSONP should not use text/plain - see http://jibbering.com/blog/?p=514
         // with "fileinfo" extension enabled, returned MIME is not quite correctly "text/plain"