patch 8.0.0920: cursor wrong after switching altscreen in terminal

Problem:    The cursor shape is wrong after switch back from an alternate
            screen in a terminal window. (arius Gedminas)
Solution:   Change bitfield to unsigned.  Set flag that cursor shape was set.
diff --git a/src/terminal.c b/src/terminal.c
index fe1d5da..020271a 100644
--- a/src/terminal.c
+++ b/src/terminal.c
@@ -1170,6 +1170,7 @@
 {
     if (in_terminal_loop == term)
     {
+	did_change_cursor = TRUE;
 	if (term->tl_cursor_color != NULL)
 	    term_cursor_color(term->tl_cursor_color);
 	else