[spellcheck runner] Make each suggestion copyable as separate item
Summary:
Before all suggestions are only shown as single item with a text of
comma-separated terms. So one cannot select a single suggested term and e.g.
copy it to the clipboard
And if correct term, the term is not copyable directly as well.
Test Plan:
Activate spellcheck runner (disabled by default), enter
"spell Compilcated" or similar
and select spellchecker menu items.
Reviewers: broulik
Reviewed By: broulik
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D10499