removed an unneeded symbol

app/Http/Controllers/MarkController.php

@@ -193,7 +193,7 @@ class MarkController extends Controller
             $references = $evidence->references;
             $temp = [];
             foreach ($references as $key => $value) {
-                $ref_evidence = $this->server()->findEvidenceById($value);;
+                $ref_evidence = $this->server()->findEvidenceById($value);
                 array_push($temp, $ref_evidence);
             }
             $evidence->references = $temp;