patch 8.2.1955: Vim9: not all command modifiers are tested

Problem:    Vim9: not all command modifiers are tested.
Solution:   Add tests for remaining modifiers.
diff --git a/src/version.c b/src/version.c
index 231a4f0..d4cddb8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1955,
+/**/
     1954,
 /**/
     1953,