The goals dropdown shows goals linked to other channels than current channel

This bug has appeared after the removal of the extJS. Now, when you create a goal for a specific channel, it is available for all the channels.

Steps to reproduce:

1. Go to the Content Audiences perspective
2. Go to the Goals tab
3. Add a goal for the Alternative channel
4. Go to the Hippo Acceptance Project channel
5. Select a component
6. Select a segment for the component
7. Go to the Experiments tab
8. Open the Goals dropdown list

Expected result:

The goal created in step 3 should not be visible

Actual result:

The goal is visible