Problem description: Trailing and leading spaces in "Value" and "Mapped to" fields are not trimmed when creating a new value mapping, but these fields are trimmed during update of the same value mapping.

Steps to reproduce:

1. Create a new value mapping - make sure that value mapping "Name", as well as Mapping fields "Value" and "Mapped to" contain trailing and leading spaces
2. Save the value mapping
3. Open the created value mapping in edit mode
   Result 1: Trailing and leading spaces are trimmed only in the name of the value mapping. Trailing spaces still exist in Mapping fields "Value" and "Mapped to"
4. Press "Update" button
5. Open the updated value mapping again
   Result 2: Now trailing and leading spaces are trimmed in all fields.

Expected: Trailing and leading spaces should be trimmed in all fields also when creating a new value mapping.

Example: