Output something from the console sample even if it's ran without arguments.

Running console sample without parameters didn't do anything by default and
didn't output anything neither which was presumably rather confusing. Do
output a welcome message at least to indicate that something happened.

Closes #13299.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@68209 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775