fix closing search dropdown (#1142)

* using a different library for javascript selects, fixing the closing search dropdown
* fix closing dropdown for daterangepicker
* added missing search button for mobile on customer page
* fix meta fields with same names than existing columns

tests/DependencyInjection/ConfigurationTest.php

@@ -279,7 +279,7 @@ class ConfigurationTest extends TestCase
             'theme' => [
                 'active_warning' => 3,
                 'box_color' => 'green',
-                'select_type' => null,
+                'select_type' => 'selectpicker',
                 'auto_reload_datatable' => false,
                 'show_about' => true,
                 'chart' => [