Fix unexpected-error-title text

[microbit-robert]

The error description and error title are the same. We don't use the title text, we use the description text twice but don't pass a link where it is used for the title.

"unexpected-error-description": {
    "defaultMessage": "Please try again or <link>raise a support request</link>",
    "description": "Text shown for unexpected error scenarios"
  },
  "unexpected-error-title": {
    "defaultMessage": "Please try again or <link>raise a support request</link>",
    "description": "Text shown for unexpected error scenarios"
  },

title: this.intl.formatMessage({ id: "unexpected-error-description" }),