Show original filename in reload dialog

[PinkPandaKatie]

Is your feature request related to a problem? Please describe.
I have projects which have a lot of parts. I usually keep one 3mf file with all the parts in it, and slide them around to the bed when needed.

If I rename one or more parts, and I press F5 to reload, I get a dialog box that says "Please select file to reload", but that doesn't tell me which part could not be found.

Describe the solution you'd like
It would be helpful if the title of the dialog said "Please select the file to reload for XXXXX.stl" where XXXXX.stl is the file that could not be found.

Describe how it would work
Looking through the code, it appears this is already implemented in src/slic3er/GUI/Plater.cpp line 3815 but is #ifdefed out for all platforms except MacOS. This change would simply be removing that #ifdef.

Describe alternatives you've considered
The only alternative is to either a) unzip the 3mf, open the XML, and do a find and replace or b) individually find all parts and replace them manually.