patch 8.2.0408: delete() commented out for testing

Problem:    Delete() commented out for testing.
Solution:   Undo commenting-out.
diff --git a/src/testdir/test_vim9_disassemble.vim b/src/testdir/test_vim9_disassemble.vim
index 5ba18dd..99bec43 100644
--- a/src/testdir/test_vim9_disassemble.vim
+++ b/src/testdir/test_vim9_disassemble.vim
@@ -778,7 +778,7 @@
     nr += 1
   endfor
 
-  " delete('Xdisassemble')
+  delete('Xdisassemble')
 enddef
 
 def s:Execute()