Revert "Restore cursor when exiting alt mode."

This reverts commit 52900255d9.

st.c

@@ -1379,8 +1379,6 @@ tswapscreen(void)
 	term.images_alt = im;
 	#endif // SIXEL_PATCH
 	term.mode ^= MODE_ALTSCREEN;
-	if (!IS_SET(MODE_ALTSCREEN))
-		xsetdefaultcursor();
 	tfulldirt();
 }
 

win.h

@@ -43,7 +43,6 @@ int xsetcolorname(int, const char *);
 void xseticontitle(char *);
 void xsettitle(char *);
 int xsetcursor(int);
-void xsetdefaultcursor(void);
 void xsetmode(int, unsigned int);
 void xsetpointermotion(int);
 void xsetsel(char *);

x.c

@@ -2414,16 +2414,6 @@ xsetcursor(int cursor)
 	return 0;
 }
 
-void
-xsetdefaultcursor(void)
-{
-	#if BLINKING_CURSOR_PATCH
-	xsetcursor(cursorstyle);
-	#else
-	xsetcursor(cursorshape);
-	#endif // BLINKING_CURSOR_PATCH
-}
-
 void
 xseturgency(int add)
 {