Do not close segment, when searching with CTRL+F

When searching for something with the search function, an opened segment is closed, when translate5 jumps to the search result.

This is necessary when replacing something, yet when simply a search is performed, this is contra productive for the translator, who wants to continue editing is current segment and is simply interested in looking up something further down or up in the task.

So when the search-tab is open in the search function, the current segment should simply stay open. And then of course the checkbox "Save segment on close" can be removed from the search tab and only stay there in the replace tab (where the current behavior makes absolute sense to close the current segment, when jumping to a search result, because you actually want to do something in the next segment).