QLocaleData::numberToCLocale(): clarify some conditionals and comments

Some of the complex conditionals were done in two stages, with an
outer condition on a block with a comment explaining an inner
condition.  Rework those to simpler statements in the conditions and
move the preconditions of what each comment explains to the outer
conditional.

In the process, refine some of the conditionals. All group-size checks
should be conditioned on last_separator_idx != -1, since we only
constrain grouping by its rules, when present. The grouping separator
can be empty (in system locale, if configured by user) so grouping
can't be mandatory.

Change-Id: Id3af7aafa6f70ecaea020a9fe0d6031f1ed9f84e
Reviewed-by: Ievgenii Meshcheriakov <ievgenii.meshcheriakov@qt.io>

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