we removed ScreenSelectGroup, let's remove the ShowSelectGroup preference that's just taking up space.

src/PrefsManager.cpp

@@ -200,7 +200,6 @@ PrefsManager::PrefsManager() :
 	m_bMercifulSuperMeter		( "MercifulSuperMeter",		true ),
 	m_bDelayedBack			( "DelayedBack",		true ),
 	m_bShowInstructions		( "ShowInstructions",		true ),
-	m_bShowSelectGroup		( "ShowSelectGroup",		false ),
 	m_bShowCaution			( "ShowCaution",		true ),
 	m_bShowNativeLanguage		( "ShowNativeLanguage",		true ),
 	m_iArcadeOptionsNavigation	( "ArcadeOptionsNavigation",	0 ),

src/PrefsManager.h

@@ -188,7 +188,6 @@ public:
 	Preference<bool>	m_bMercifulSuperMeter; // negative super deltas are scaled by the players life percentage
 	Preference<bool>	m_bDelayedBack;
 	Preference<bool>	m_bShowInstructions; // how to play a mode
-	Preference<bool>	m_bShowSelectGroup; // uh i thought we removed this shit -aj
 	Preference<bool>	m_bShowCaution;
 	Preference<bool>	m_bShowNativeLanguage;
 	Preference<int>	m_iArcadeOptionsNavigation;