Merge pull request #5117 from jellyfin/fix-framerate-locale

Make FRAME-RATE field culture invariant

(cherry picked from commit 63be32630254508bdc021a726bb6f892a4b2c930)
Signed-off-by: Joshua M. Boniface <joshua@boniface.me>

Jellyfin.Api/Helpers/DynamicHlsHelper.cs

@@ -427,7 +427,7 @@ namespace Jellyfin.Api.Helpers
             if (framerate.HasValue)
             {
                 builder.Append(",FRAME-RATE=")
-                    .Append(framerate.Value);
+                    .Append(framerate.Value.ToString(CultureInfo.InvariantCulture));
             }
         }