textproc/fcitx5-configtool: Update to 5.0.2

Now requires exact version of textproc/fcitx5 and textproc/fcitx5-qt to build.

Submitted by: Ka Ho Ng <khng300@gmail.com> (maintainer)
Sponsored by: FreeBSD Foundation
Approved by: lwhsu
Differential Revision: https://reviews.freebsd.org/D28113