"Change Server" button not working on failed login

[tuliomir]

To reproduce this error, have a started wallet pointing to a fullnode that is somehow not available ( internet unavailable or fullnode is offline )

Open the wallet app, insert the correct pin and wait for the "server error" modal to open.
Click the "Change Server" button and the following page will be displayed

This is related to the recent changes to the "Network Settings" screen on #701 .