Change namespace for defaults controllers

To allow proper path prefix for view partials when using
config.action_view.prefix_partial_path_with_controller_namespace

app/views/default/units/index.html.erb

@@ -0,0 +1,17 @@
+<div class="rightside buttongrid">
+  <%= image_link_to t('.back'), 'arrow-left-bold-outline', units_path %>
+</div>
+
+<table class="main items">
+  <thead>
+    <tr>
+      <th><%= User.human_attribute_name(:symbol).capitalize %></th>
+      <% if current_user.at_least(:active) %>
+        <th><%= t :actions %></th>
+      <% end %>
+    </tr>
+  </thead>
+  <tbody id="units">
+    <%= render(@units, partial: 'default') || render_no_items %>
+  </tbody>
+</table>

app/views/units/defaults/index.html.erb

@@ -1,2 +0,0 @@
-<h1>Units::Defaults#index</h1>
-<p>Find me in app/views/units/defaults/index.html.erb</p>

app/views/units/index.html.erb

@@ -2,9 +2,8 @@
   <% if current_user.at_least(:active) %>
     <%= image_link_to t('.add_unit'), 'plus-outline', new_unit_path, id: :add_unit,
       onclick: 'this.blur();', data: {turbo_stream: true} %>
-    <%= image_link_to t('.import_units'), 'import', units_defaults_path, class: 'tools',
-      data: {turbo_stream: true} %>
   <% end %>
+  <%= image_link_to t('.import_units'), 'download-outline', default_units_path, class: 'tools' %>
 </div>
 
 <%= tag.div id: :unit_form %>