Use ui_text_submit instead of ui_accept to confirm and close text prompts

[jsjtxietian]

Fixes #81161
ui_accept key map includes key Space, should use ui_text_submit.

[Maran23]

Hmm, I think a better default for confirming a dialog would be the ENTER key. That is more in line what other UI framework and/or operating systems are doing,

So maybe we need another action, maybe we can use the ui_text_submit here?

This looks like the right action here IMO, since you accept a text inside the dialog.
If not, we need to think about a new action, something like ui_confirm, which also maps to ENTER and KP ENTER.

[jsjtxietian]

Thank you for your feedback! I will change the code to use ui_text_submit, seems like the suitable one.

[YuriSizov]

Same change needs to be done to editor/plugins/theme_editor_plugin.cpp, another affected dialog from #77297.

Edit: Would be also good to amend the commit message. You can use my edit of the title, or a shorter version of it: "Use ui_text_submit to confirm and close text prompts"

[akien-mga]

Thanks!

[YuriSizov]

Cherry-picked for 4.1.2.