recording: Fix video processing incompatibility with Ruby 2.7

The Fcntl::F_SETPIPE_SZ constant was added in Ruby 3.0, but Ubuntu 20.04
still uses Ruby 2.7. Add some error handling so processing doesn't fail
if the constant is not found.

record-and-playback/core/lib/recordandplayback/edl/video.rb

@@ -558,6 +558,8 @@ module BigBlueButton
               ffmpeg_preprocess_write.fcntl(Fcntl::F_SETPIPE_SZ, 1_048_576)
             rescue Errno::EPERM
               BigBlueButton.logger.warn('Unable to increase pipe size to 1MB')
+            rescue NameError
+              # Fcntl::F_SETPIPE_SZ isn't available on Ruby version older than 3.0
             end
 
             in_time = video[:timestamp] + seek_offset