patch 8.2.1190: Vim9: checking for Vim9 syntax is spread out

Problem:    Vim9: checking for Vim9 syntax is spread out.
Solution:   Use in_vim9script().
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 5436373..64b143b 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -1765,7 +1765,7 @@
 	ea.cmd = skipwhite(ea.cmd + 1);
 
 #ifdef FEAT_EVAL
-    if (current_sctx.sc_version == SCRIPT_VERSION_VIM9 && !starts_with_colon)
+    if (in_vim9script() && !starts_with_colon)
     {
 	if (ea.cmd > cmd)
 	{