Selecting 'none' for array design when creating a raw bioassay still set the project default array design

[Nicklas Nordborg]

• Create a project and activate it.
• Create an array design and set it as the project default.
• Create a new raw bioassay. The array design should already be selected, select 'none' instead.
• Save. The raw bioassay still get the default array design.

[Nicklas Nordborg]

(In [6583]) Fixes #1877: Selecting 'none' for array design when creating a raw bioassay still set the project default array design