test: update error message for JSON.parse

V8 5.0 introduced a small modification for the unexpected end of input
error.

PR-URL: #5945
Reviewed-By: bnoordhuis - Ben Noordhuis <[email protected]>
Reviewed-By: indutny - Fedor Indutny <[email protected]>

Author: targos

test/parallel/test-repl.js

@@ -156,7 +156,7 @@ function error_test() {
       expect: /^SyntaxError: Unexpected number/ },
     // should throw
     { client: client_unix, send: 'JSON.parse(\'{\');',
-      expect: /^SyntaxError: Unexpected end of input/ },
+      expect: /^SyntaxError: Unexpected end of JSON input/ },
     // invalid RegExps are a special case of syntax error,
     // should throw
     { client: client_unix, send: '/(/;',