Fix docker file build form to read the files from its local uploader, rather than just the first one it finds

static/js/directives/ui/dockerfile-build-form.js

@@ -158,7 +158,7 @@ angular.module('quay').directive('dockerfileBuildForm', function () {
         $scope.uploading = true;
         $scope.uploading_progress = 0;
 
-        var uploader = $('#file-drop')[0];
+        var uploader = $element.find('#file-drop')[0];
         if (uploader.files.length == 0) {
           handleMissingFile();
           $scope.uploading = false;