[CoreAttachWindow] Don't update the gamelet if operation is cancelled by the user. User can select a new gamelet to attach to and only if they've chosen a new instance and clicked `ok` it should get set in the window. Otherwise, the selected instance should stay the same.
[CoreAttachWindow] Don't update the gamelet if operation is cancelled
by the user.
User can select a new gamelet to attach to and only if they've chosen a
new instance and clicked `ok` it should get set in the window.
Otherwise, the selected instance should stay the same.

GitOrigin-RevId: d5679303c4caafff745d44c58d7fed27d11aab1a

googlestadia/vsi-lldb,googlestadia/vsi-lldb,googlestadia/vsi-lldb