Submit text-input forms when pressing ENTER

[jotaen4tinypilot]

For all input fields around user management and authentication, you can submit the form by pressing ENTER on your keyboard (while the text field has focus).

I don’t see a good reason why we shouldn’t have that behaviour elsewhere as well (where we have text input fields). That would be:

• Hostname dialog
• Wake-on-LAN dialog
• Virtual Media dialog (Upload via URL)