[IMPROVEMENT] Select previous server when close the app while adding

[djorkaeffalexandre]

@RocketChat/ReactNative

Test plan:

1

• Start the app
• Select some server and don't do the login
• Close the app and open again
• You should be outside

2

• Start the app
• Login to some server
• Start add a new server
• Select some server and don't do the login
• Close the app
• Open it again
• It should show the previous logged server

3

• Disable your connection
• Start the app with 2 servers logged in
• Change from server 1 to server 2
• Close the app
• Open it again
• It should be show the latest server selected