patch 8.2.2629: Vim9: error for #{{ is not desired

Problem:    Vim9: error for #{{ is not desired.
Solution:   Adjust the checks. (closes #7990)
diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index de6eabd..afe5f7d 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -2155,6 +2155,10 @@
       # automatic conversion from number to string
       var n = 123
       var dictnr = {[n]: 1}
+
+      # comment to start fold is OK
+      var x1: number #{{ fold
+      var x2 = 9 #{{ fold
   END
   CheckDefAndScriptSuccess(lines)