Fix unsupported network bugs

[garethfuller]

Description

If the user's wallet is connected to a network that we don't have a config for a few bugs existed:

• The warning and request to switch network banner didn't appear
• The user's account btn in the nav disappeared.

This PR fixes these bugs.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other

How should this be tested?

Please provide instructions so we can test. Please also list any relevant details for your test configuration.

• Try to connect to the app with an unsupported network, e.g. xDai, and see if anything breaks.

Checklist:

• I have performed a self-review of my own code
• I have commented my code where relevant, particularly in hard-to-understand areas
• My changes generate no new console warnings
• The base of this PR is master if hotfix, develop if not

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