Demlo: Delete ffmpeg workaround for taglib

.config/demlo/scripts/99-ffmpeg.lua

@@ -1,17 +0,0 @@
--- Force tagging with FFmpeg: this is a workaround until taglib gains arbitrary
--- tag support.
-
-output.parameters = output.parameters or {}
-local flag = false
-for k, v in ipairs(output.parameters) do
-	if v == "-c:a" then
-		flag = true
-		break
-	end
-end
-
-if not flag then
-	output.parameters[#output.parameters+1] = "-c:a"
-	output.parameters[#output.parameters+1] = "copy"
-end
-output.parameters[#output.parameters+1] = "-vn"