Simplify Url::addFilter()

This changes the rendered resulting Url from x&(y&z) to x&y&z.

refs #10778

library/Icinga/Web/Url.php

@@ -219,10 +219,9 @@ class Url
     public function addFilter($and)
     {
         $this->setQueryString(
-            Filter::matchAll(
+            Filter::fromQueryString($this->getQueryString())
-                $and,
+                ->andFilter($and)
-                Filter::fromQueryString($this->getQueryString())
+                ->toQueryString()
-            )->toQueryString()
         );
         return $this;
     }