pass readthrough id to shelf_selector

- allows user to move book from a shelf to the 'Read' shelf using the move button.

bookwyrm/templates/snippets/shelf_selector.html

@@ -11,6 +11,8 @@
 {% block dropdown-list %}
 {% with book.id|uuid as uuid %}
 {% active_shelf book as active_shelf %}
+{% latest_read_through book request.user as readthrough %}
+
 {% for shelf in user_shelves %}
 
 {% if shelf.editable %}
@@ -67,7 +69,5 @@
 
 {% include 'snippets/reading_modals/finish_reading_modal.html' with book=active_shelf.book controls_text="finish_reading" controls_uid=uuid  move_from=current.id readthrough=readthrough %}
 
-{% include 'snippets/reading_modals/progress_update_modal.html' with book=active_shelf.book controls_text="progress_update" controls_uid=uuid move_from=current.id readthrough=readthrough %}
-
 {% endwith %}
 {% endblock %}