Fix minor style issues in StockSource/StockWidget

This pull request fixes some minor style issues in StockSource and StockWidget. Most are whitespace-issues, but some unused code is also removed.
    What do you mean with "very specific source"?

A source whose output includes information that requires "special" handling by the widget that displays it. By "special" handling I mean interpreting and properly displaying things such as the `color` of a build in the `BuildWidget`, or the `pointsDone`/`pointsTotal` in the `ScrumWidget`. This usually requires a very specific widget and a default title is easy to guess.