[FIX] base_import_async: restore class

In migration to 16.0, input class `oe_import_queue` was replaced by
another one when it has to be added instead, causing the module not
to work. In Javascript, input is searched by this class and it's not
found, so value cannot be recovered and import is made
synchronously.

base_import_async/readme/CONTRIBUTORS.rst

@@ -14,3 +14,4 @@ Other contributors include:
 * Guewen Baconnier (Camptocamp)
 * `Trobz <https://trobz.com>`_:
     * Dzung Tran <[email protected]>
+* Daniel Duque (FactorLibre)

base_import_async/static/src/xml/import.xml

@@ -7,7 +7,11 @@
 after splitting your file in small chunks that will be processed independently.
 Use this to import very large files."
             >
-                <input type="checkbox" class="form-check-input" id="oe_import_queue" />
+                <input
+                    type="checkbox"
+                    class="oe_import_queue form-check-input"
+                    id="oe_import_queue"
+                />
                 <label for="oe_import_queue">Import in the background</label>
             </div>
         </t>