gitRemoteSetOriginAction: Upsert instead of insert

I had used `INSERT` as a placeholder while trying to get the plugin
working properly. This would create a row every time the "git remote set
origin" command was invoked. What I really wanted was an upsert.

Looked through a number of different ways of accomplishing that in
SQLite:
- https://stackoverflow.com/questions/418898/sqlite-upsert-not-insert-or-replace/7511635#7511635
- https://stackoverflow.com/questions/15277373/sqlite-upsert-update-or-insert

Ended up settling on this solution from CL.:
https://stackoverflow.com/questions/20323174/upsert-in-sqlite/20326705#20326705

It seemed to be pretty clean and understandable, so I leveraged that
approach.

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