tweaks: remove a stray space

Reported-by: Brand Huntsman <alpha@qzx.com>

src/winio.c

@@ -659,7 +659,7 @@ int parse_kbinput(WINDOW *win)
 #ifndef NANO_TINY
 	/* When <Tab> is pressed while the mark is on, do an indent. */
 	if (retval == TAB_CODE && openfile->mark && currmenu == MMAIN &&
-							openfile-> mark != openfile->current)
+							openfile->mark != openfile->current)
 		return INDENT_KEY;
 #endif