The feedback module lets you alternate between responses being anonymised and
not anonymised. When the module is in anonymous mode, its possible for a single
user to make multiple responses.
However when the activity is switched to non-anon mode, if a user leaves a
follow up feedback, one of their previously anonymous responses is used, so
their new response stays anonymous and their old anon response is lost.
This change lets them leave a new non-anonymised feedback entry and retains all
previous anonymous responses instead of incorrectly reusing one of their anon
ones at random.
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