Scrollbars are missing for PropertyList types

Description

Steps to reproduce:

1. Install EPiServer.Forms 4.3.0 as a test.
2. Create a new Form Block.
3. Go to the All-Properties mode for the Form Block.
4. Go to the Setting tab
5. Add dummy data under "Send email after form submission." Add more than five rows.
6. You cannot see other rows because the scrollbar doesn't appear.

Expected: Scrollbar appears after five rows of data are entered.
Actual: Scrollbar is missing.