Update color scheme on package initialization.

Removes the delay in applying a color scheme on startup.

Author: JoeRobich

src/VisualStudio/Core/Def/Implementation/ColorSchemes/ColorSchemeApplier.cs

@@ -80,7 +80,7 @@ public void Initialize()
 
                 VSColorTheme.ThemeChanged += VSColorTheme_ThemeChanged;
 
-                QueueColorSchemeUpdate(themeChanged: true);
+                UpdateColorScheme(themeChanged: true);
             }
         }