Revert "Revert "Fix #795: Close lightbox only if buttons, ESC key or the X icon is pressed""

This reverts commit a367787f26.

app/coffee/modules/common/lightboxes.coffee

@@ -31,11 +31,6 @@ class LightboxService extends taiga.Service
             lightbox.addClass('open')
         ), 70
 
-        lightbox.on 'click', (e) =>
-            target = angular.element(e.target)
-            if target[0] == lightbox[0]
-                @close(lightbox)
-
         $(document)
             .on 'keydown.lightbox', (e) =>
                 code = if e.keyCode then e.keyCode else e.which
@@ -52,6 +47,7 @@ class LightboxService extends taiga.Service
 
 module.service("lightboxService", LightboxService)
 
+
 LightboxDirective = (lightboxService) ->
     link = ($scope, $el, $attrs) ->
         $el.on "click", ".close", (event) ->