Summary 

When trying to insert a 'Version picker' customfield to the Forms, the Linked Jira field doesn't show up the customfield.

Steps to reproduce

• Create a customfield of type 'Version picker'
• Go to Manage apps >> Forms >> Add a question of type 'Dropdown'
• From the window that comes on the right, try to search for the customfield that we created in the step 1

Expected Results

The customfield shows up and we are able to link the same to the form question

Actual Results

The Version picker customfield doesn't show up in the drop down and is unable to be linked