patch 8.2.3074: popup_atcursor() uses wrong position with concealing

Problem:    popup_atcursor() uses wrong position with concealing.
Solution:   Keep w_wcol in conceal_check_cursor_line(). (closes #8476)
diff --git a/src/ui.c b/src/ui.c
index 65ac626..b3d125c 100644
--- a/src/ui.c
+++ b/src/ui.c
@@ -1082,7 +1082,7 @@
 # endif
 
 # ifdef FEAT_CONCEAL
-    conceal_check_cursor_line();
+    conceal_check_cursor_line(FALSE);
 # endif
 }