Move DBStats test to UI test repo & updating UI test screenshots.

plugins/DBStats/tests/UI/DBStats_spec.js

-/*!
- * Piwik - Web Analytics
- *
- * Screenshot tests for the DBStats plugin.
- *
- * @link http://piwik.org
- * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
- */
-
-describe("DBStats", function () {
-    this.timeout(0);
-
-    var url = "?module=DBStats&action=index&idSite=1&period=day&date=yesterday";
-
-    it("should load correctly", function (done) {
-        expect.screenshot('admin_page').to.be.capture(function (page) {
-            page.load(url);
-        }, done);
-    });
-});
\ No newline at end of file

UI @ 1329c5ad

-Subproject commit c33ae0cf434c8434b47414f2f6f1523310ab8d46
+Subproject commit 1329c5ad4a1524047b75b81e8bdd629ff4be6a5b