patch 8.2.0104: using channel or job with ":execute" has strange effects

Problem:    Using channel or job with ":execute" has strange effects.
Solution:   Give an error message for Job and Channel.
diff --git a/src/version.c b/src/version.c
index 54104eb..3362ab5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    104,
+/**/
     103,
 /**/
     102,