patch 8.1.0726: redrawing specifically for conceal feature

Problem:    Redrawing specifically for conceal feature.
Solution:   Use generic redrawing methods.
diff --git a/src/version.c b/src/version.c
index 743712d..c7d63f1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -796,6 +796,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    726,
+/**/
     725,
 /**/
     724,