Final statistics cleanup

- Characters is default page because it's Dr Eggman's game
- Keep page when exiting menu and returning
- Remove/comment out the overview page, since the overview is currently visible on all pages

src/k_menu.h

@@ -1261,10 +1261,10 @@ boolean M_ChallengesInputs(INT32 ch);
 
 typedef enum
 {
-	statisticspage_basic = 0,
+	//statisticspage_overview = 0,
+	statisticspage_chars = 0,
 	statisticspage_gp,
 	statisticspage_maps,
-	statisticspage_chars,
 	statisticspage_max
 } statisticspage_t;
 

src/menus/extras-statistics.c

@@ -257,7 +257,6 @@ void M_Statistics(INT32 choice)
 	statisticsmenu.nummedals = M_CountMedals(true, false);
 	statisticsmenu.numextramedals = M_CountMedals(true, true);
 
-	statisticsmenu.page = statisticspage_basic;
 	M_StatisticsPageInit();
 
 	MISC_StatisticsDef.prevMenu = currentMenu;