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.
Signed-off-by: Carlos Alberto Lopez Perez <clopez@igalia.com> Signed-off-by: Ross Burton <ross.burton@intel.com>