[FIX] website_slides_forum : fix elearning navbar style in forum

Since design refactoring from af41382f, eLearning navbar style
was not displayed correctly. This commit fixes this by applying same design
rules as user profile page navbar.

Task ID : 1941250
PR #31512

addons/website_forum/static/src/scss/website_forum.scss

@@ -218,3 +218,8 @@ img.o_forum_avatar_big {
         min-height: 75px;
     }
 }
+
+.o_wforum_elearning_navtabs_container {
+    height: $owprofile-tabs-height;
+    background-color: #66445e;
+}

addons/website_slides_forum/views/website_slides_forum_templates.xml

@@ -3,9 +3,9 @@
     <template id="website_slides_forum_header" inherit_id="website_forum.header">
         <xpath expr="//div[hasclass('container')]" position="before">
             <t t-if="forum.slide_channel_id">
-                <div class="row" style="background-color: #66445e; height:  48px;">
-                    <div class="container o_wprofile_navtabs_container">
-                        <ul class="nav nav-tabs o_wprofile_nav_tabs" role="tablist" id="profile_extra_info_tablist">
+                <div class="row o_wforum_elearning_navtabs_container">
+                    <div class="container">
+                        <ul class="nav nav-tabs o_wprofile_nav_tabs mt-0 flex-nowrap" role="tablist" id="profile_extra_info_tablist">
                             <li class="nav-item">
                                 <a t-att-href="'/slides/%s%s?%s' % (slug(forum.slide_channel_id), '/%s' % slug(category) if category else '', keep_query('debug'))"
                                     t-att-class="'nav-link o_wprofile_navlink'" style="border-left: 0px">