Share URL behavior Adjustments

[jordanlovato]

UI bug:

1. Open a gz file in the viewer
2. Go to the "Share" tab
3. Create a Share link
4. Go to the "Debug" tab
5. Go back to the "Share" tab
6. Observe that share url is no longer there and must be recreated

From Srl
ah... yes. bad implementation
cause the url is a local state that gets wiped when the component gets dropped

[jordanlovato]

Additionally, if a share url is being used, the UI still allows the generation of a superfluous share URL. In this case, I think the UI should supply the user with the current window URL, assuming it is a share URL.