Update default Charts window width

* Set the window width default to 845px which is just enough
  to fit the controls along the top in the default font size and locale.
* Fix an obvious type in a comment in ChartWindow.cpp

src/tests/kits/game/chart/Chart.cpp

@@ -33,7 +33,7 @@ main()
 
 ChartApp::ChartApp() : BApplication("application/x-vnd.Be.ChartDemo")
 {
-	fWindow = new ChartWindow(BRect(120, 150, 629, 591),
+	fWindow = new ChartWindow(BRect(120, 150, 965, 591),
 		B_TRANSLATE_SYSTEM_NAME("Chart"));
 
 	// showing the window will also start the direct connection. If you

src/tests/kits/game/chart/ChartWindow.cpp

@@ -51,7 +51,7 @@ enum {
 
 #define	MAX_FONT_SIZE	12.0f
 
-/* various offse, width, height and position used to align and
+/* various offset, width, height and position used to align and
    set the various UI elements. */
 enum {
 	TOP_LEFT_LIMIT	= 26,