[Merge] lp:~rpadovani/webbrowser-app/settings-page into lp:webbrowser-app

[Olivier Tilloy]

Review: Needs Fixing

I managed to get in a situation where two search engine entries are checked:

 - open settings
 - click "Search Engines"
 - verify that e.g. the first one is checked
 - check the second one
 - click "Search Engines" again
 - check the first one
 - click "Search Engines" again

 -> both entries are checked
-- 
https://code.launchpad.net/~rpadovani/webbrowser-app/settings-page/+merge/253975
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