fix: cast allowComments to boolean (#3381)

Signed-off-by: Christian Hartmann <chris-hartmann@gmx.de>

Author: Chartman123

lib/Db/Form.php

@@ -215,7 +215,7 @@ public function read() {
 			'confirmationEmailSubject' => $this->getConfirmationEmailSubject(),
 			'confirmationEmailBody' => $this->getConfirmationEmailBody(),
 			'confirmationEmailQuestionId' => $this->getConfirmationEmailQuestionId(),
-			'allowComments' => $this->getAllowComments(),
+			'allowComments' => (bool)$this->getAllowComments(),
 		];
 	}
 }