Filter stream input and output type label aren't linked to the corresponding select

Steps to reproduce:

1. Install the Filter Streams Converter Application
2. Open the "Filter Streams Converter" application in the applications panel
3. Click on "Input type" and then on "Output type"

Expected result:

The corresponding select element is focused (blue outline).

Actual result:

Nothing happens.

This is an accessibility issue as the select element has no associated label.