Launch parameters not being persisted

[fugasjunior]

When the user types in a custom launch parameter but doesn't press enter to parse and save it into the field, it is not persisted in the database.

Steps to reproduce:

1. Create a new server of any type
2. In the "Custom launch parameters" field, type -maxFPS 60, but don't press enter.
3. Click "Submit"
4. View the server settings

Expected result:
-maxFPS 60 is present in "Custom launch parameters" field

Actual result:
The "Custom launch parameters" field is empty

Possible solution:
Parse and save the parameter on form submit if it's still being edited.