refs #768, adjusted GUI components to previous changes

* such as changed completers
* also minor typo fixes, formatting
* removed outdated qss

src/blackgui/settings/guisettings.h

@@ -38,7 +38,6 @@ namespace BlackGui
             //! \copydoc BlackCore::TSettingTrait::defaultValue
             static QString defaultValue() { return QStringLiteral("Fusion"); }
         };
-
     } // ns
 } // ns