[FIX] website_slides: move tours under /static/

All assets have to be loadable directly from the browser, /tests/ is not
accessible, /static/ is.

addons/website_slides/views/assets.xml

@@ -35,10 +35,10 @@
 
         <template id="assets_tests" inherit_id="web.assets_tests" name="Slides Tests Assets">
             <xpath expr="." position="inside">
-                <script type="text/javascript" src="/website_slides/tests/tours/slides_tour_tools.js"/>
-                <script type="text/javascript" src="/website_slides/tests/tours/slides_course_member.js"/>
-                <script type="text/javascript" src="/website_slides/tests/tours/slides_course_member_yt.js"/>
-                <script type="text/javascript" src="/website_slides/tests/tours/slides_course_publisher.js"/>
+                <script type="text/javascript" src="/website_slides/static/src/tests/tours/slides_tour_tools.js"/>
+                <script type="text/javascript" src="/website_slides/static/src/tests/tours/slides_course_member.js"/>
+                <script type="text/javascript" src="/website_slides/static/src/tests/tours/slides_course_member_yt.js"/>
+                <script type="text/javascript" src="/website_slides/static/src/tests/tours/slides_course_publisher.js"/>
             </xpath>
         </template>