`run_dev()` fails when returning invisibly [BUG]

[ilyaZar]

Describe the bug
The last line of the current run_dev() has an invisible return value

I mean

return(invisible(file))

This causes golem::run_dev() to fail in a fresh golem like so

Meaning there is no pop-up of the App in a new webbrowser.

To Reproduce
Steps to reproduce the behavior:

1. create a fresh golem
2. call golem::run_dev() to the screen
3. not tested in vscode but RStudio

Expected behavior
Removing the last line return(invisible(file)) fixes this i.e. do

This produces in RStudio the usual messages and a running golem skeleton:

Can be fixed via #1091

[VincentGuyader]

thanks a lot