Fix: str don't have toUtf8 method.

[jhilmer]

QLineEdit.text() returns str which don't have toUtf8 method.
Later an command is build up based on this input. I have tested
that it still works with unicode characters.

[jhilmer]

Fix for #898

[buhtz]

Thanks for your contribution. Please be aware of the discussion in #1232 especially #1232 (comment) .

I wonder why this old code (.toUtf8()) could live so long. Do you have any explanation for that?

EDIT:
I am scared that this could break up BiT no matter that all tests are green. Let's take the discussion back to the Issue ticket.

[buhtz]

Please excuse my timidness about this two tiny lines. 😆

After doing some research and testing I agree this is an reproducible issue and that PR does fix it.
I also checked the repo for more uses of toUtf8() but couldn't find them.

The reason why no one else before found it is just that this dialog is rarely or nearly never used by someone before.

So dear @emtiu please just merge it and close #898.