Update Data Preparer Location Question in LDN

[jbesraa]

Change the "If you are a data preparer. What is your location (City and Country)" question to a dropdown with the same dropdown and answers as the "Data owner Country/Region" question in the Large Dataset DataCap Application (LDN)

For the "If you are a data preparer. What is your location (City and Country)" question the dropdown should have all of the following countries

https://github.com/filecoin-project/filecoin-plus-large-datasets/issues/new/choose

[clriesco]

Done. I have also reviewed if I had to modify something in the bot, but haven't found anything.