Fix SpeciesFileGroup/taxonpages#209

Find using int of fingerpint

app/controllers/images_controller.rb

@@ -45,7 +45,7 @@ def api_index
 
   # GET /api/v1/images/:id
   def api_show
-    @image = Image.where(project_id: sessions_current_project_id).find_by(id: params[:id])
+    @image = Image.where(project_id: sessions_current_project_id).find_by(id: params.permit(id: :integer)[:id])
     @image ||= Image.where(project_id: sessions_current_project_id).find_by(image_file_fingerprint: params[:id])
 
     render plain: 'Not found. You may need to add a &project_token= param to the URL currently in your address bar to access these data. See https://api.taxonworks.org/ for more.', status: :not_found and return if @image.nil?