[Bug] Form element's Description field data is lost after Input type edit

[andrew-s-titov]

Form element's Description field data is lost in data schema after element edit if the last field updated is Input Type.
Checked on https://ginkgobioworks.github.io/react-json-schema-form-builder/

Steps to reproduce:

1. create a Form element on Visual Form Builder or Pre-Configured Components tab
2. fill the Description field
3. go to Edit Schema tab to make sure there's a description prop in data schema (under property key)
4. go back to the tab with the created Form element
5. change element's Input Type field, do not "touch" any other element's fields
6. go to Edit Schema tab

Actual result:

• no description prop in data schema (field's data is silently erased)
• no Description data after returning back to Visual Form Builder or Pre-Configured Components where the element was created

Expected result:

• Description field data and description prop in data schema stays the same as before edit as there were no changes for it.