Change obsolete How to Order button to Preferences

This will allow Linux users to access the preferences UI while I work out how to implement menus on Linux

src/game/boe.graphics.cpp

@@ -372,7 +372,7 @@ void draw_startup_stats() {
 void draw_start_button(eStartButton which_position,short which_button) {
 	rectangle from_rect,to_rect;
 	// TODO: Change third button (Windows calls it "Support and Downloads")
-	const char *button_labels[] = {"Load Game","Make New Party","How To Order",
+	const char *button_labels[] = {"Load Game","Make New Party","Preferences",
 		"Start Scenario","Custom Scenario","Quit"};
 	// The 0..65535 version of the blue component was 14472; the commented version was 43144431
 	sf::Color base_color = {0,0,57};

src/game/boe.startup.cpp

@@ -64,9 +64,7 @@ bool handle_startup_press(location the_point) {
 					break;
 					
 				case STARTBTN_ORDER:
-					// TODO: Figure out something to put here.
-//					give_reg_info();
-//					draw_startup(0);
+					pick_preferences();
 					break;
 					
 				case STARTBTN_JOIN: // regular scen