ZP-797 Fixed WBXML class constant.

Released under the Affero GNU General Public License (AGPL) version 3.

src/lib/wbxml/wbxmlencoder.php

@@ -305,7 +305,7 @@ class WBXMLEncoder extends WBXMLDefs {
      */
     private function _contentStream($stream, $asBase64) {
         // write full stream, including the finalizing terminator to the output stream (stuff outTermStr() would do)
-        $this->outByte(WBXML_STR_I);
+        $this->outByte(self::WBXML_STR_I);
         fseek($stream, 0, SEEK_SET);
         if ($asBase64) {
             $out_filter = stream_filter_append($this->_out, 'convert.base64-encode');