*/R-cran-*: Fixup WWW entries

[dteske]

Summary

Make consistent the domain with s/CRAN.R-project/cran.r-project/
and use the new URL not the old deprecated package URL

[dteske]

Inspired by D60718 and follow-up to D59714

[dteske]

Note that making these all consistent is another step toward asking portmgr if we can then remove them, following the introduction of sensible default introduced by D59678 (we wouldn't remove all WWW from every R-cran-* port, just potentially the ones that set the same value as the default introduced by D59678)