fix: allow reupload of contract document by admins if rejected

addresses #869brd1gn

src/Security/Voter/DispositionVoter.php

@@ -106,6 +106,8 @@ class DispositionVoter extends Voter
             return false;
         }
 
-        return null === $disposition->getDocumentByType(Upload::TYPE_CONTRACT);
+        $existingContract = $disposition->getDocumentByType(Upload::TYPE_CONTRACT);
+
+        return null === $existingContract || Upload::STATUS_REJECTED === $existingContract->getStatus();
     }
 }