patch 8.2.2931: Vim9: line continuation comment uses legacy syntax

Problem:    Vim9: line continuation comment still uses legacy syntax in one
            place.
Solution:   Check for #\ instead of "\ earlier. (closes #8316)
diff --git a/src/version.c b/src/version.c
index f89a149..57a4dcd 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2931,
+/**/
     2930,
 /**/
     2929,