Reduced code for filename trim

Signed-off-by: Magnus Walbeck <mw@mwalbeck.org>

lib/private/Files/Type/Detection.php

@@ -169,9 +169,7 @@ class Detection implements IMimeTypeDetector {
 		$fileName = basename($path);
 
 		// remove leading dot on hidden files with a file extension
-		if (strpos($fileName, '.') === 0 && strpos($fileName, '.', 1)) {
-			$fileName = substr($fileName, 1);
-		}
+		$fileName = ltrim($fileName, '.');
 
 		// note: leading dot doesn't qualify as extension
 		if (strpos($fileName, '.') > 0) {