MAINT: ripe expert: fix mode parameter usage
MAINT: ripe expert: fix mode parameter usage

after the automatic conversion of self.parameters -> self, the member
__mode is obsolete and the same as mode.

certtools/intelmq,aaronkaplan/intelmq,certtools/intelmq,aaronkaplan/intelmq,certtools/intelmq,aaronkaplan/intelmq