Fix encoding vCard file when contains PHOTO;ENCODING=b (#1488683)

Conflicts:

	tests/Framework/VCard.php

CHANGELOG

@@ -1,6 +1,7 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Fix encoding vCard file when contains PHOTO;ENCODING=b (#1488683)
 - Fix focus issue in IE when selecting message row (#1488620)
 - Fix displaying all headers when they contain malformed characters (#1488666)
 - Fix decoding of HTML messages with UTF-16 charset specified (#1488654)

program/include/rcube_vcard.php

@@ -558,6 +558,7 @@ class rcube_vcard
           if ((list($key, $value) = explode('=', $attr)) && $value) {
             $value = trim($value);
             if ($key == 'ENCODING') {
+              $value = strtoupper($value);
               // add next line(s) to value string if QP line end detected
               if ($value == 'QUOTED-PRINTABLE') {
                 while (preg_match('/=$/', $lines[$i]))