TITANIC: Remove redundant static from CStarControlSub6

It was only ever used as a temporary matrix in the constructor.
Given that, it was cleaner to simply declare it as a local variable.

engines/titanic/star_control/star_control.cpp

@@ -43,13 +43,11 @@ END_MESSAGE_MAP()
 
 CStarControl::CStarControl() : _enabled(false),
 		_starRect(20, 10, 620, 350) {
-	CStarControlSub6::init();
 	CStarControlSub12::init();
 	DMatrix::init();
 }
 
 CStarControl::~CStarControl() {
-	CStarControlSub6::deinit();
 	CStarControlSub12::deinit();
 	DMatrix::deinit();
 }

engines/titanic/star_control/star_control_sub6.cpp

@@ -24,8 +24,6 @@
 
 namespace Titanic {
 
-CStarControlSub6 *CStarControlSub6::_static;
-
 CStarControlSub6::CStarControlSub6() {
 	clear();
 }
@@ -80,15 +78,6 @@ CStarControlSub6::CStarControlSub6(const CStarControlSub6 *s1, const CStarContro
 		+ s2->_vector._z;
 }
 
-void CStarControlSub6::init() {
-	_static = nullptr;
-}
-
-void CStarControlSub6::deinit() {
-	delete _static;
-	_static = nullptr;
-}
-
 void CStarControlSub6::identity() {
 	FMatrix::identity();
 	_vector.clear();

engines/titanic/star_control/star_control_sub6.h

@@ -28,11 +28,6 @@
 namespace Titanic {
 
 class CStarControlSub6 : public FMatrix {
-private:
-	static CStarControlSub6 *_static;
-public:
-	static void init();
-	static void deinit();
 public:
 	FVector _vector;
 public: