DzlSuggestion: Support secondary icon
In Epiphany we need support for a secondary icon within DzlSuggestion/Row to:
- fix a regression introduced with the libdazzle switch (Bookmarks are no longer marked with a star on the right side)
- Jump to tab could make use of an icon and use the subtitle as address (fixes another open bug)
- Indicates jump to windows option
I do have a patch ready for libdazzle, in case you want to add it.