multimedia/ffdec: Update to 13.0.1

Also, do minor rearrangements in Makefile as suggested by portclippy.

• https://github.com/jindrapetrik/jpexs-decompiler/releases/tag/version13.0.0
• https://github.com/jindrapetrik/jpexs-decompiler/releases/tag/version13.0.1

PR: 253412
Submitted by: Naram Qashat <cyberbotx AT cyberbotx DOT com> (maintainer)