patch 8.2.3393: escaping for fish shell is skipping some characters

Problem:    Escaping for fish shell is skipping some characters.
Solution:   Escape character after backslash if needed. (Jason Cox,
            closes #8827)
diff --git a/src/version.c b/src/version.c
index 9f67d79..3a16dda 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3393,
+/**/
     3392,
 /**/
     3391,