Resolve "Queue thinks requests still exists even though they are deleted"

What does this mr do?

See #680 (closed) issue description and comments

Actions taken to fix bug

The order of the keys within the @SQLDelete statement was switched. This means that Feedback entities are now correctly soft deleted, and it stops the feedback page from not rendering. For a more longer term solution with regards to how we deal with feedback and deleted requests, see #616 (closed)

Does this MR meet the acceptance criteria?

• I have added a changelog entry to reflect the significant changes I made and the bug I fixed.
• I have updated the documentation accordingly.
• I adhere to the style guide.

src/main/java/nl/tudelft/queue/model/Feedback.java

@@ -46,7 +46,7 @@ import nl.tudelft.queue.model.labs.Lab;
 @NoArgsConstructor
 @AllArgsConstructor
 @Where(clause = "deleted_at IS NULL")
-@SQLDelete(sql = "UPDATE feedback SET deleted_at = NOW() WHERE request_id = ? AND assistant_id = ?")
+@SQLDelete(sql = "UPDATE feedback SET deleted_at = NOW() WHERE assistant_id = ? AND request_id = ?")
 public class Feedback {
 	/**
 	 * The embeddable id of a Feedback object.