[BUG] Connection deletions on Connections table page are not effected

[kodymoodley]

Describe the bug

Whenever some or all connections in the Connections table are selected and the delete button is clicked, no connections are deleted. They remain in the table and in the export file.

To Reproduce

Steps to reproduce the behavior:

1. Load this example (with 9 connections): Mitigation budgeting (2).json
2. Click on 'Connections table'
3. Select one or more connections using the checkboxes in the first column of the table
4. Click on the red delete / trash-can icon

Expected behavior

I expected the:

• Table to be immediately updated by removing the selected connections.
• Deleted connections to not appear in the 'connections' entry in the exported JSON file, when I click on 'Download Project' in the main menu
• The corresponding edges to be removed from the component and statement network views