[arabic] Bug 82306 - Mandaic had errors in its Unicode Joining_Type

Fixes https://bugs.freedesktop.org/show_bug.cgi?id=82306

src/hb-ot-shape-complex-arabic-table.hh

diff --git a/src/hb-ot-shape-complex-arabic-table.hh b/src/hb-ot-shape-complex-arabic-table.hh
index d41d6ce..1710049 100644
--- a/src/hb-ot-shape-complex-arabic-table.hh
+++ b/src/hb-ot-shape-complex-arabic-table.hh
@@ -70,7 +70,7 @@
 
   /* Mandaic */
 
-  /* 0840 */ R,D,D,D,D,D,R,D,D,R,D,D,D,D,D,R,D,D,D,D,R,D,U,U,U,X,X,X,X,X,X,X,
+  /* 0840 */ R,D,D,D,D,D,R,R,D,R,D,D,D,D,D,D,D,D,D,D,R,D,U,U,U,X,X,X,X,X,X,X,
   /* 0860 */ X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,
   /* 0880 */ X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,