Add fix for vdieo thumbnails where video is not HD

src/invidious.cr

@@ -439,7 +439,11 @@ get "/watch" do |env|
   host_params = env.request.query_params
   host_params.delete_all("v")
 
-  thumbnail = "https://i.ytimg.com/vi/#{id}/maxresdefault.jpg"
+  if fmt_stream.select { |x| x["label"].starts_with? "hd720" }.size != 0
+    thumbnail = "https://i.ytimg.com/vi/#{video.id}/maxresdefault.jpg"
+  else
+    thumbnail = "https://i.ytimg.com/vi/#{video.id}/hqdefault.jpg"
+  end
 
   templated "watch"
 end
@@ -1525,7 +1529,11 @@ get "/embed/:id" do |env|
   host_params = env.request.query_params
   host_params.delete_all("v")
 
-  thumbnail = "https://i.ytimg.com/vi/#{id}/maxresdefault.jpg"
+  if fmt_stream.select { |x| x["label"].starts_with? "hd720" }.size != 0
+    thumbnail = "https://i.ytimg.com/vi/#{video.id}/maxresdefault.jpg"
+  else
+    thumbnail = "https://i.ytimg.com/vi/#{video.id}/hqdefault.jpg"
+  end
 
   rendered "embed"
 end

src/invidious/views/watch.ecr

@@ -18,7 +18,7 @@
 <meta name="twitter:url" content="<%= host_url %>/watch?v=<%= video.id %>">
 <meta name="twitter:title" content="<%= HTML.escape(video.title) %>">
 <meta name="twitter:description" content="<%= description %>">
-<meta name="twitter:image" content="https://i.ytimg.com/vi/<%= video.id %>/maxresdefault.jpg">
+<meta name="twitter:image" content="<%= thumbnail %>">
 <meta name="twitter:player" content="<%= host_url %>/embed/<%= video.id %>">
 <meta name="twitter:player:width" content="1280">
 <meta name="twitter:player:height" content="720">