Enable PhET-iO testing for CT.

[pixelzoom]

While PhET-iO instrumentation is in-progress, some CT testing has been disabled. This issue is a reminder to enable testing when instrumentation has been completed.

• Remove these entries from phet-io-state-unsupported, run cd perennial; grunt generate-data:

equality-explorer
equality-explorer-basics
equality-explorer-two-variables

• Remove this from package.json files, run grunt update:

    "phet-io": {
      "validation": false
    },

[zepumph]

Today we decided in our "green team" meeting that type:automated-testing only applies to failing CT tests (to help us manage the current errors on CT). Unlabelling.