small fix

src/invidious/routes/api/manifest.cr

@@ -163,7 +163,7 @@ module Invidious::Routes::API::Manifest
                 url = template_url.gsub("$M", "$Number$")
 
                 storyboard_width = storyboard[:storyboard_width]
-                
+
                 tile_count = tiles_per_page
                 duration = tile_count * interval_seconds
 
@@ -175,13 +175,13 @@ module Invidious::Routes::API::Manifest
 
                 xml.element("AdaptationSet", id: i, mimeType: mime_type, contentType: "image") do
                   xml.element("SegmentTemplate", media: url, duration: duration, startNumber: "0")
-                  xml.element("Representation", id: "thumbnails_#{id}", bandwidth: bandwidth, width: width, height: height) do
+                  xml.element("Representation", id: "thumbnails_#{i}", bandwidth: bandwidth, width: width, height: height) do
                     xml.element("EssentialProperty", schemeIdUri: "http://dashif.org/guidelines/thumbnail_tile", value: "#{storyboard_width}x#{storyboard_height}")
                   end
                 end
                 i += 1
-              end          
-           end  
+              end
+            end
           end
         end
       end