New scene title is not saved in the JSON file

[Algorush]

There's always title='scene'

[kfarr]

@Algorush thanks I tested and reproduced, however this is just for downloaded 3dstreet.json files and not cloud, the cloud title and rename saving seems to work as expected.

Here seems to be the offending line:
https://github.com/3DStreet/3dstreet/blob/main/src/json-utils_1.1.js#L58

[kfarr]

fixed with #573