bug: bare 'edit review' URL shows a map with default coordinates

[wbazant]

Constructing a URL like https://beta.fallingfruit.org/reviews/66067/edit takes a user to the default location, but we should be showing the location which is being reviewed.

This is a bug of very low severity since it does not happen during normal navigation - the only way to go to an edit review page is from a location page, where we do correctly show a map.

I just changed some related stuff and noticed that it happens so I fixed it (very easily with AI). The proposed resolution is to recognize that the situation is happening in ConnectReview, fetch the review's location, then set the position.