Fixed exit crash on legacy OS X

There is no need to close (and thus deallocate) console window explicitly
This will be done by autorelease pool in application controller event loop
OS X with GC and/or ARC was not affected by this issue
Older versions like 10.4 or 10.5 crashed because of double deallocation

src/posix/cocoa/st_console.h

@@ -85,7 +85,6 @@ private:
 	int                  m_netMaxPos;
 
 	FConsoleWindow();
-	~FConsoleWindow();
 
 	void ExpandTextView(float height);
 

src/posix/cocoa/st_console.mm

@@ -118,11 +118,6 @@ FConsoleWindow::FConsoleWindow()
 	[m_window makeKeyAndOrderFront:nil];
 }
 
-FConsoleWindow::~FConsoleWindow()
-{
-	[m_window close];
-}
-
 
 static FConsoleWindow* s_instance;