Revert "allow customisable thumbnail size in the image picker."

I totally forgot that this was already customisable with the Refinery::Images.user_image_sizes setting!

This reverts commit fc23691.

core/app/views/refinery/admin/_image_picker.html.erb

@@ -7,8 +7,6 @@
   current_image_link_href = refinery.insert_admin_images_path(:dialog => true, :callback => "image_picker_#{randomiser}_changed",
                                                     :width => 866, :height => 510, :conditions => conditions)
   current_image_title = t('.change', :what =>  description.titleize)
-
-  geometry ||= Refinery::Images.user_image_sizes[thumbnail.to_sym]
 -%>
 <div id='image_picker_container_<%= randomiser %>'>
   <%= link_to t('.show'), '', :class => "current_image_toggler" if toggle_image_display %>
@@ -17,7 +15,7 @@
   <div class='current_image_container' style="margin-top: 10px<%= ";display: none" if toggle_image_display %>">
     <a class='current_image_link dialog' href="<%= current_image_link_href %>" style='border: 0px' title='<%= current_image_title  %>' name='<%= current_image_title %>'>
       <% unless image.nil? -%>
-        <%= image_fu image, geometry,
+        <%= image_fu image, Refinery::Images.user_image_sizes[thumbnail.to_sym],
                      :class => "brown_border",
                      :class => "current_picked_image" %>
       <% else -%>