revert changes in validate script that broke versioning

[dakota002]

This removes the id checking. The checks in place here broke versioning.

The validation script would run on the commit mid-version command, before the tag had been applied to a commit, so you would see errors like:

(not finding the correct ref)

error: gcn\notices\glowbug\Alert.schema.json: expected value of $id to be https://gcn.nasa.gov/schema/main/gcn\notices\glowbug\Alert.schema.json, but found https://gcn.nasa.gov/schema/v4.1.1/gcn/notices/glowbug/Alert.schema.json

or

(forward vs backslash on Windows)

error: gcn\notices\core\Event.schema.json: expected value of $id to be https://gcn.nasa.gov/schema/main/gcn\notices\core\Event.schema.json, but found https://gcn.nasa.gov/schema/main/gcn/notices/core/Event.schema.json

[lpsinger]

Please don't revert this. I'll fix it tomorrow.

[dakota002]

Closing so as not to revert completely