🎁 Make alt text for default thumbnails dynamic

This commit will update both AllinsonFlex and IIIF Print to bring in the
partials that affect certain thumbnail images.  They should now have
their alt text respect the alt text that has been set in the Appearance
tab.

Ref:
  - samvera-labs/allinson_flex#118
  - scientist-softserv/iiif_print#267
  - #471

Gemfile.lock

@@ -1,6 +1,6 @@
 GIT
   remote: https://github.com/samvera-labs/allinson_flex.git
-  revision: e98815f6178cc17fab70c189d0fe96a618384a7a
+  revision: f493853597c71334d436bbe57d62e1ee7f5ada74
   specs:
     allinson_flex (0.1.0)
       json_schemer
@@ -124,7 +124,7 @@ GIT
 
 GIT
   remote: https://github.com/scientist-softserv/iiif_print.git
-  revision: 7b82aa323db891f5f8e362e13bf3f14b4fe9e0dc
+  revision: eb320b1c454f0219d9e17fd12fd2b525770123b2
   branch: main
   specs:
     iiif_print (1.0.0)

app/helpers/hyrax_helper.rb

@@ -42,6 +42,6 @@ def default_collction_image
   end
 
   def default_work_image
-    Site.instance.default_work_image? ? Site.instance.default_work_image.url : 'default.png'
+    Site.instance.default_work_image? ? Site.instance.default_work_image.url : 'work.png'
   end
 end

app/views/hyrax/collections/_media_display.html.erb

@@ -1,8 +1,8 @@
 <% if presenter.thumbnail_path %>
   <%= image_tag presenter.thumbnail_path,
                 class: "representative-media",
-                alt: "",
+                alt: block_for(name: 'default_collection_image_text'),
                 role: "presentation" %>
 <% else %>
   <%= image_tag(Site.instance.default_collection_image) %>
-<% end %>
+<% end %>