* lisp/simple.el (next-line-completion): Better handing of group lines.

* lisp/simple.el (next-line-completion): Better handing of group lines.

Simplify to not compare the result of 'move-to-column'
with the value 'column'.  Such comparison prevented from moving
over lines without completion candidates such as group lines (bug#68688).

* test/lisp/minibuffer-tests.el (completions-group-navigation-test):
Add more group candidates to create more columns and to test
moving over group lines and over columns without candidates.

(cherry picked from commit d22a3e5afe75c9f4a18926cce16c1a13fa912df2)