Continued search widget cleanup; remove needless KToolBar usage.
Continuing on from the work in commit fc6fecd6 where Carl Schwan noticed that the SearchLine class (used as a base search input element within the PlaylistSplitter and within the Advanced Search playlist dialog) didn't really need to be a QWidget. The resulting improvement to the search line's appearance above the list of music tracks came very close to looking like a no-overhead widget, but there was still a 1-pixel padding on the left/right between the line that wasn't present for the playlist tracks themselves. The cause was the nearby SearchWidget class (used in the PlaylistSplitter), which is a thin wrapper around SearchLine, and for some reason is a KToolBar. This may have been intended at some point in JuK's prehistory (e.g. to allow for dockable/movable search line) but at this point the search line always shows up in the same spot and isn't even parented into the toolwindow where a toolbar normally would go. As a result this doesn't need to be anything other than a QWidget either, and making this change allows the search bar to line up pixel-perfect with the list of music tracks as it should. GUI: CHANGELOG:Removes unintended padding between search line and rest of interface.
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