pages/watch: URL encode 'action' in download widget

Caught in the review of PR 5224, but forgot to click on "send review" in time. I realized that too late, after the PR was already merged.

src/invidious/frontend/watch_page.cr

@@ -32,7 +32,7 @@ module Invidious::Frontend::WatchPage
     return String.build(4000) do |str|
       str << "<form"
       str << " class=\"pure-form pure-form-stacked\""
-      str << " action='#{url}'"
+      str << " action='" << URI.encode_www_form(url) << "'"
       str << " method='post'"
       str << " rel='noopener'"
       str << " target='_blank'>"

src/invidious/yt_backend/youtube_api.cr

@@ -42,7 +42,6 @@ module YoutubeAPI
 
     TvHtml5
     TvHtml5ScreenEmbed
-    TvSimply
   end
 
   # List of hard-coded values used by the different clients
@@ -179,11 +178,6 @@ module YoutubeAPI
       version:    "2.0",
       screen:     "EMBED",
     },
-    ClientType::TvSimply => {
-      name:       "TVHTML5_SIMPLY",
-      name_proto: "74",
-      version:    "1.0",
-    },
   }
 
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