CSS: Remove inline styling of the download widget (#4162)

assets/css/default.css

@@ -793,3 +793,7 @@ h1, h2, h3, h4, h5, p,
 .channel-emoji {
   margin: 0 2px;
 }
+
+#download_widget {
+    width: 100%;
+}

src/invidious/frontend/watch_page.cr

@@ -42,8 +42,7 @@ module Invidious::Frontend::WatchPage
       str << translate(locale, "Download as: ")
       str << "</label>\n"
 
-      # TODO: remove inline style
-      str << "\t\t<select style=\"width:100%\" name='download_widget' id='download_widget'>\n"
+      str << "\t\t<select name='download_widget' id='download_widget'>\n"
 
       # Non-DASH videos (audio+video)