patch 8.1.1394: not restoring t_F2 in registers test

Problem:    Not restoring t_F2 in registers test.
Solution:   Assign to &t_F2 instead of t_F2. (Andy Massimino, closes #4434)
diff --git a/src/version.c b/src/version.c
index f774932..2d4c3c0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1394,
+/**/
     1393,
 /**/
     1392,