Added default int value support to standards number type

[OfficialEsco]

This is a quick little PR which adds a default int variable that can be used for setting the default number of a setting.
This can and should be used in a few places already

"addedComponent": [
      {
        "type": "number",
        "label": "Phishing email threshold. (Default 1)",
        "name": "standards.AntiPhishPolicy.PhishThresholdLevel",
        "default": 1
      },