Mk/Uses/cran.mk: default WWW to the canonical CRAN package URLHEADmain

The WWW of older R ports is https://cran.r-project.org/web/packages/${PORTNAME}
The WWW of newer R ports is https://cran.r-project.org/package=${PORTNAME}

There are currently 230 R-cran ports using the older URL and 168 using the
newer.  R-cran does not recommend the older URL format. If it goes away, we’ll
have to update WWW on over 200 R-cran ports.

At present, there are 497 R-cran ports setting WWW and all but 99 use either
the old or new standard URL.

If cran.mk offered a default WWW then we could eliminate the need to maintain
WWW at the individual port level.

All R-cran ports that set a WWW location that is not on cran directly would
continue to do-so while the ones that could stand to inherit a sensible default
could be nimble enough to not have to worry about their old deprecated URL
format one day not working.

Approved by:	fuz (mentor)
Reviewed by:	fuz (mentor)
Differential Revision:	https://reviews.freebsd.org/D59678

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