Improve data sent to analytics to track it more easily

[ggalmazor]

We were having trouble verifying that the usage information was being sent to GA, mainly because we weren't filling some fields that one would normally fill if the app was a website (following the recommendation on the GA manuals).

This PR sets the document path and title to the tab the user opens to trick GA into thinking that the app is a website. This improves a lot the information available on GA about Briefcase usage.

Previously we were even having trouble seen realtime usage information, which on this PR seems to work better.

What has been done to verify that this works as intended?

Manually launched Briefcase and verified on GA that we are sending data.

Why is this the best possible solution? Were any other approaches considered?

No other option for the moment.

Are there any risks to merging this code? If so, what are they?

Nope

Does this change require updates to documentation? If so, please file an issue at https://github.com/opendatakit/docs/issues/new and include the link below.

Nope

[kkrawczyk123]

@ggalmazor None of my actions pull/push/export from all three operating systems were tracked on google analytics in real time events.
@opendatakit-bot unlabel "needs testing"

[ggalmazor]

@kkrawczyk123 I can see all my tab changes real-time... Can you check again, please? Bear in mind that it has some delay and that the real-time dashboard is not 100% reliable.

The most reliable dashboard to verify that GA integration works is the one that lists visited pages per version.