patch 8.2.0835: Motif: mapping <C-bslash> still doesn't work

Problem:    Motif: mapping <C-bslash> still doesn't work.
Solution:   Accept CSI for K_SPECIAL.  Do not apply CTRL to the character
            early.  (closes #6150)
diff --git a/src/version.c b/src/version.c
index 24a5767..37b363e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    835,
+/**/
     834,
 /**/
     833,