patch 8.1.0849: cursorline highlight is not always updated

Problem:    Cursorline highlight is not always updated.
Solution:   Set w_last_cursorline when redrawing.  Fix resetting cursor flags
            when using the popup menu.
diff --git a/src/screen.c b/src/screen.c
index 570910e..1370773 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -3712,6 +3712,7 @@
     {
 	line_attr = HL_ATTR(HLF_CUL);
 	area_highlighting = TRUE;
+	wp->w_last_cursorline = wp->w_cursor.lnum;
     }
 #endif