expect_token: fix token value in error messages

There was a mistype, S.token.val -> S.token.value.

Author: ChALkeR

src/api.js

@@ -136,7 +136,7 @@ function qmlweb_parse($TEXT, document_type, exigent_mode) {
     if (is(type, val)) {
       return next();
     }
-    token_error(S.token, "Unexpected token " + S.token.type + " " + S.token.val + ", expected " + type + " " + val);
+    token_error(S.token, "Unexpected token " + S.token.type + " " + S.token.value + ", expected " + type + " " + val);
   };
 
   var statement_js = statement;

tests/qml/invalid/ParseError.qml.json

@@ -1,6 +1,6 @@
 {
   "error": {
     "name": "Error",
-    "message": "Unexpected token name undefined, expected punc : (line: 4, col: 11, pos: 38)\n  1  import QtQuick 2.5\n  2  \n  3  Item {\n>>4    properly int error: 11\n  5  }\n  6  \n\n"
+    "message": "Unexpected token name int, expected punc : (line: 4, col: 11, pos: 38)\n  1  import QtQuick 2.5\n  2  \n  3  Item {\n>>4    properly int error: 11\n  5  }\n  6  \n\n"
   }
 }