ShareByMailProvider: getAccessList: set both array keys 'public' and 'mail'

To preserve prior behaviour where 'public' was set 'true' if there
are any mail recipients. The 'mail' key will be an array of email
recipients.

Signed-off-by: Adam Serbinski <adam@serbinski.com>

apps/sharebymail/lib/ShareByMailProvider.php

@@ -1108,6 +1108,7 @@ class ShareByMailProvider implements IShareProvider {
 			));
 		$cursor = $qb->executeQuery();
 
+		$public = $cursor->rowCount() > 0;
 		$mail = [];
 		while ($row = $cursor->fetch()) {
 			if ($currentAccess === false) {
@@ -1121,7 +1122,7 @@ class ShareByMailProvider implements IShareProvider {
 		}
 		$cursor->closeCursor();
 
-		return ['public' => $mail];
+		return ['public' => $public, 'mail' => $mail];
 	}
 
 	public function getAllShares(): iterable {