FormBuilder: Change all submitted fields to not be view only

[shaneonabike]

While creating a new Form Builder with an Activity and attempting to add the Contact Update fields (for users to fill out) they weren't available.

How to reproduce

1. Create a Form Builder form
2. Attempt to add the fields to the form
3. You cannot add them to the Add section, but can add them in the Values section
   

What was expected

The ability to add these fields for users to fill out and create an Activity

Solution

As it turns out, Form Builder doesn't load custom fields that are set to "is_view": "1" (ref), but regardless they are set as Read-only so cannot be modified normally.

I would suggest that all the *_applied be modified to "is_view": "0". I think leaving the others to not being able to be modified makes a load of sense.

Thoughts? I would be happy to provide a patch, but I suspect this is going to catch others off guard like it did for me (It took me like a few hours to figure out why :( )