Fix Writer\Word2007\BaseTest error

Author: ivanlanin

tests/PhpWord/Tests/Writer/Word2007/BaseTest.php

@@ -161,7 +161,7 @@ public function testWriteImage()
 
         $archiveFile = realpath(__DIR__ . '/../../_files/documents/reader.docx');
         $imageFile = 'word/media/image1.jpeg';
-        $source = 'zip://D:\www\local\phpword\tests\PhpWord\Tests\_files\documents\reader.docx#' . $imageFile;
+        $source = 'zip://' . $archiveFile . '#' . $imageFile;
         $section->addImage($source);
 
         $doc = TestHelperDOCX::getDocument($phpWord);