Recovery of branch selection doesn't work after a send operation

[JR-Morgan]

As part of the send operation, the last step refreshes the UI so that the commit just sent displays in the UI

The branch recovery feature introduced by #196 doesn't work for this case...

Steps to reproduce:

1. Select a branch
2. Select objects & send
3. observe branch gets set to main after send

[JR-Morgan]

A more detailed steps to reproduce:

• From the list of Speckle projects, select a project that isn't the first project
• Send an object to a said project
• Observe, that the selection is in an invalid state, where no models appear in the drop down, and trying to receive leads to an unhandled exception

[JR-Morgan]

@overengineer are you interested in trying to find a fix,
again, no worries if you're busy, but please let me know.

[overengineer]

Imma look into it

[overengineer]

Selected commit should change to the new commit after send operation, right?

[JR-Morgan]

ideally, yes

[overengineer]

That was a strange bug. Active stream is reset on send operation. I overrode it on selection restoration.
Furthermore, there were two different cases. One is branch selection on default stream. Other is branch selection on a selected stream. This PR (#207) fixes both