Fix a Quicksand/Lightbox contention issue

Summary:
Fixes T11785. Lightbox calls `JX.Stratcom.pass()` to let other handlers react, but should not. At least today, we never put, e.g., links inside a lightbox.

This code appears in the original commit so it was probably just copy/pasted from somewhere and I missed it in review.

(Or there's some edge case I'm not thinking of and we'll figure it out soon enough.)

Additionally, blacklist `/file/data/` from Quicksand naviagtion: Quicksand should never fetch these URIs.

Test Plan:
  - Disabled `security.alternate-file-domain`.
  - Enabled Quicksand ("Persistent Chat").
  - Clicked an image thumbnail on a task.
    - Repeated that until things flipped out a bit.
    - After the patch: no issues.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11785

Differential Revision: https://secure.phabricator.com/D16884

src/applications/files/application/PhabricatorFilesApplication.php

@@ -129,4 +129,10 @@ final class PhabricatorFilesApplication extends PhabricatorApplication {
     );
   }
 
+  public function getQuicksandURIPatternBlacklist() {
+    return array(
+      '/file/data/.*',
+    );
+  }
+
 }

webroot/rsrc/js/core/behavior-lightbox-attachments.js

@@ -21,10 +21,7 @@ JX.behavior('lightbox-attachments', function (config) {
       return;
     }
 
-    if (JX.Stratcom.pass()) {
+    e.kill();
-      return;
-    }
-    e.prevent();
 
     var links = JX.DOM.scry(document, 'a', 'lightboxable');
     var phids = {};
@@ -230,7 +227,7 @@ JX.behavior('lightbox-attachments', function (config) {
 
   JX.Stratcom.listen(
     'click',
-    ['lightboxable', 'tag:a'],
+    ['lightboxable'],
     loadLightBox);
 
   JX.Stratcom.listen(