sysutils/htop: simplify MakefileHEADmain

This change cleans up the Makefile to follow Porter's Handbook guidance.
Here is the rationale for each change:
* As per https://docs.freebsd.org/en/books/porters-handbook/book/#makefile-master_sites-github,
  ports are urged to move to using Github releases instead of git tags.
  This change replaces USE_GITHUB with MASTER_SITES to statically point
  to htop release tarballs. This also requires the addition of USES=tar:xz
* Remove USES=autoreconf because the release tarball doesn't need to run it
* Remove USES=compiler:c11 since upstream https://github.com/htop-dev/htop
  states that a C99 compiler is needed.
* Add USES=desktop-file-utils as the port installs htop.desktop
* htop does not exist in the official NVD CPE dictionary, so as per
  https://docs.freebsd.org/en/books/porters-handbook/book/#uses-cpe, we
  should "not ever make up CPE data." Thus, USES=cpe is removed until an
  entry is contributed to the CPE dictionary
* USES={libtool,localbase,pkgconfig,python:build,shebangfix} are not
  necessary for a successful build and run with the GH release tarball.
* GNU_CONFIGURE_MANPREFIX was unnecessary since default value in
  Mk/bsd.port.mk is same ${PREFIX}/share

PR:		280820
Approved by:	Hung-Yi Chen <gaod@hychen.org> (maintainer)

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