Fix working copy not deleted on entry publish (#542)

* Fix working copy not deleted on entry publish

* fix unrelated failing test

---------

Co-authored-by: Ryan Mitchell <ryan@thoughtcollective.com>

Author: morhi

src/Revisions/Revision.php

@@ -71,4 +71,9 @@ public function model($model = null)
 
         return $this;
     }
+
+    public function toWorkingCopy(): FileEntry
+    {
+        return parent::toWorkingCopy()->model($this->model);
+    }
 }

tests/Forms/FormSubmissionTest.php

@@ -84,6 +84,7 @@ public function it_should_not_overwrite_submissions()
             'data' => [
                 'name' => 'Billy Doe',
             ],
+            'created_at' => now()->addMicrosecond(),
         ]);
 
         $this->assertCount(2, SubmissionModel::all());