Fix image url extractor

src/invidious.cr

@@ -3739,7 +3739,7 @@ get "/api/v1/channels/:ucid" do |env|
 
           qualities.each do |quality|
             json.object do
-              json.field "url", channel.author_thumbnail.gsub("=s100-", "=s#{quality}-")
+              json.field "url", channel.author_thumbnail.gsub(/=\d+/, "=s#{quality}")
               json.field "width", quality
               json.field "height", quality
             end
@@ -3781,7 +3781,7 @@ get "/api/v1/channels/:ucid" do |env|
 
                   qualities.each do |quality|
                     json.object do
-                      json.field "url", related_channel.author_thumbnail.gsub("=s48-", "=s#{quality}-")
+                      json.field "url", related_channel.author_thumbnail.gsub(/=\d+/, "=s#{quality}")
                       json.field "width", quality
                       json.field "height", quality
                     end
@@ -4079,7 +4079,7 @@ get "/api/v1/playlists/:plid" do |env|
 
           qualities.each do |quality|
             json.object do
-              json.field "url", playlist.author_thumbnail.gsub("=s100-", "=s#{quality}-")
+              json.field "url", playlist.author_thumbnail.gsub(/=\d+/, "=s#{quality}")
               json.field "width", quality
               json.field "height", quality
             end

src/invidious/channels.cr

@@ -804,12 +804,13 @@ def fetch_channel_community(ucid, continuation, locale, config, kemal_config, fo
                           width = thumbnail["width"].as_i
                           height = thumbnail["height"].as_i
                           aspect_ratio = (width.to_f / height.to_f)
+                          url = thumbnail["url"].as_s.gsub(/=w\d+-h\d+(-p)?(-nd)?(-df)?(-rwa)?/, "=s640")
 
                           qualities = {320, 560, 640, 1280, 2000}
 
                           qualities.each do |quality|
                             json.object do
-                              json.field "url", thumbnail["url"].as_s.gsub("=s640-", "=s#{quality}-")
+                              json.field "url", url.gsub(/=s\d+/, "=s#{quality}")
                               json.field "width", quality
                               json.field "height", (quality / aspect_ratio).ceil.to_i
                             end

src/invidious/search.cr

@@ -176,7 +176,7 @@ struct SearchChannel
 
           qualities.each do |quality|
             json.object do
-              json.field "url", self.author_thumbnail.gsub("=s176-", "=s#{quality}-")
+              json.field "url", self.author_thumbnail.gsub(/=\d+/, "=s#{quality}")
               json.field "width", quality
               json.field "height", quality
             end

src/invidious/videos.cr

@@ -319,7 +319,7 @@ struct Video
 
           qualities.each do |quality|
             json.object do
-              json.field "url", self.author_thumbnail.gsub("=s48-", "=s#{quality}-")
+              json.field "url", self.author_thumbnail.gsub(/=s\d+/, "=s#{quality}")
               json.field "width", quality
               json.field "height", quality
             end