patch 9.0.1141: 'cursorcolumn' and 'colorcolumn' wrong after concealing

Problem:    'cursorcolumn' and 'colorcolumn' wrong after concealing and
            wrapping line.
Solution:   Reset "wlv.vcol_off" after each screen line. (Alexey Radkov,
            closes #11777)
diff --git a/src/drawline.c b/src/drawline.c
index 11cfb77..a82a5e4 100644
--- a/src/drawline.c
+++ b/src/drawline.c
@@ -3893,6 +3893,7 @@
 	    wlv_screen_line(wp, &wlv, FALSE);
 	    wlv.col += wlv.boguscols;
 	    wlv.boguscols = 0;
+	    wlv.vcol_off = 0;
 #else
 	    wlv_screen_line(wp, &wlv, FALSE);
 #endif