fix client error retrieving softcore unlocks with aggregate queries on

[Jamiras]

'DateEarnedHardcore' => $unlock->unlocked_hardcore_at?->format('Y-m-d H:i:s'),

would return a null entry for DateEarnedHardcore, whereas the non-aggregate code does not populate the key. This caused the filtering code for the unlocks and startsession requests to not produce the desired results.

RAWeb/public/dorequest.php

Lines 392 to 394 in c0fa537

	$response['UserUnlocks'] = collect($userUnlocks)
	->filter(fn ($value, $key) => array_key_exists('DateEarnedHardcore', $value))
	->keys();

RAWeb/public/dorequest.php

Lines 325 to 335 in c0fa537

	if (array_key_exists('DateEarnedHardcore', $unlock)) {
	$response['HardcoreUnlocks'][] = [
	'ID' => $achId,
	'When' => strtotime($unlock['DateEarnedHardcore']),
	];
	} else {
	$response['Unlocks'][] = [
	'ID' => $achId,
	'When' => strtotime($unlock['DateEarned']),
	];
	}

In fact, the strtotime call would change the value from null to false resulting in unparseable timestamps for the client.

{"Success":true,"HardcoreUnlocks":[{"ID":361917,"When":false},{"ID":361918,"When":false},{"ID":361919,"When":false},
{"ID":361921,"When":false},{"ID":361922,"When":false},{"ID":361924,"When":false},{"ID":361925,"When":false},
{"ID":361928,"When":false},{"ID":361931,"When":false}],"ServerNow":1697396485}