Fix reading of asset type from schema

[tomgreenfield]

Expected Behaviour

As part of the scaffold refactor in version 0.6, we strived to standardise the schema input types. This included removing the need to scrub strings with regular expressions, and instead allowing an object to specfiy options. For an asset, the desired schema includes a media field:

"_photo": {
  "type": "string",
  "default": "",
  "title": "Photo",
  "inputType": {
    "type": "Asset",
    "media": "image"
  },
  "help": "Select a photo"
}

Actual Behaviour

Although the scaffold can already handle it, asset management errors with the new schema:

assetManagementModalView.js:28 Uncaught TypeError: this.options.assetType.replace is not a function

There are also some tweaks needed to the new theme editor.

Steps to Reproduce

1. Update an asset field to use the new inputType
2. Click Select an asset on the form

Versions

• Authoring Tool Version: 0.9

[canstudios-nicolaw]

@tomgreenfield Please could you be a bit more explicit about step 1 on the reproduce instructions? Would help with testing

[tomgreenfield]

For example, this input type:

"inputType": "Asset:image"

would be updated to:

"inputType": {
  "type": "Asset",
  "media": "image"
}