Saving a Space does not change pathname

[pyphilia]

The update when saving a space happens in the redux store, but pathname is not updated at this moment. We might have path space/7slvq0 even after saving it.

This is a problem when we want to go back from another path, we lose the saved information and SpaceHeader will display the unsaved buttons.

This bug happens when export a space with selection.

To reproduce:

• visit space 7slvq0
• save space
• export space (with whatever options)

The space header displays the save button.