Fix the search box forgetting the location where the user was previously searching into.
To do a search on "All Files" instead of setting the m_searchPath to $HOME, it checks the button state, so the "From Here" location is not lost.
As an added benefit, selecting "Your Files" when in a non-indexed folder will use the baloo search instead of a fully non-indexed search from $HOME.
This issue is the last remaining one of the series started with D24422, with the purpose of fixing the searchbox parsing and update.