webkitgtk: move recommends on ca-certificates from epiphany to webkitgtk.

webkitgtk: move recommends on ca-certificates from epiphany to webkitgtk.

 * The webkitgtk package should recommend the ca-certificates one,
   because any program usign webkit (and not only epiphany) would
   expect that the CAs certificates are available and that https
   validation works as expected.

 * For example, webkitgtk includes a MiniBrowser program that would
   fail to proper verify https sites if the ca-certificate package
   is not installed

 * Instead of making each one of the webkitgtk consumers care about
   the certificate package, do this in webkit itself.

(From OE-Core rev: fe694f9713595fc5f83c47111f03fc8a0a222f14)

Signed-off-by: Carlos Alberto Lopez Perez <clopez@igalia.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>