Refactor PhabricatorBadgesEditRecipientsController to remove dead code

Summary: `$form` in `$dialog = id(new AphrontDialogView())->appendForm($form)` is only defined when `if ($can_edit)` was `true` beforehand. But that was always true. Thus add a variable definition (and remove some unused variables like `$form_box`).

Test Plan:
Visit the page /badges/recipients/1/ or also directly /badges/recipients/1/add/ and add some recipients. It still works as before.

Visit the page without enough permissions. It does not allow to edit them, as before.

Reviewers: O1 Blessed Committers, valerio.bozzolan

Reviewed By: O1 Blessed Committers, valerio.bozzolan

Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Differential Revision: https://we.phorge.it/D25744

src/applications/badges/controller/PhabricatorBadgesEditRecipientsController.php

@@ -49,26 +49,15 @@ final class PhabricatorBadgesEditRecipientsController
         ->setURI($view_uri);
     }
 
-    $can_edit = PhabricatorPolicyFilter::hasCapability(
-      $viewer,
-      $badge,
-      PhabricatorPolicyCapability::CAN_EDIT);
-
-    $form_box = null;
-    $title = pht('Add Recipient');
-    if ($can_edit) {
-      $header_name = pht('Edit Recipients');
-
-      $form = new AphrontFormView();
-      $form
-        ->setUser($viewer)
-        ->setFullWidth(true)
-        ->appendControl(
-          id(new AphrontFormTokenizerControl())
-            ->setName('phids')
-            ->setLabel(pht('Recipients'))
-            ->setDatasource(new PhabricatorPeopleDatasource()));
-    }
+    $form = new AphrontFormView();
+    $form
+      ->setUser($viewer)
+      ->setFullWidth(true)
+      ->appendControl(
+        id(new AphrontFormTokenizerControl())
+          ->setName('phids')
+          ->setLabel(pht('Recipients'))
+          ->setDatasource(new PhabricatorPeopleDatasource()));
 
     $dialog = id(new AphrontDialogView())
       ->setUser($viewer)