patch 8.2.1386: backslash not removed afer space with space in 'isfname'

Problem:    Backslash not removed afer space in option with space in
            'isfname'.
Solution:   Do remove backslash before space, also when it is in 'isfname'.
            (Yasuhiro Matsumoto, closes #6651)
diff --git a/src/version.c b/src/version.c
index ea89d2d..e251ba8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1386,
+/**/
     1385,
 /**/
     1384,