(maint) Don't instantiate service multiple times
(maint) Don't instantiate service multiple times

This was causing registration of the SettingsChanged event to never fire.
As a result, changes in setting screen were not being reflected in the
UI.  This was a bug introduced after some refactoring of the IoC
Container.

gep13/ChocolateyGUI,chocolatey/ChocolateyGUI,chocolatey/ChocolateyGUI,gep13/ChocolateyGUI,gep13/ChocolateyGUI,chocolatey/ChocolateyGUI,gep13/ChocolateyGUI,chocolatey/ChocolateyGUI,chocolatey/ChocolateyGUI,gep13/ChocolateyGUI