‘Unknown’ displayed instead of ‘mainnet’ for DeWeb providers on v0.4.3

On the DeWeb head banner.

For providers running version v0.4.3, the banner displays "Unknown" instead of "mainnet", whereas for providers on version v0.4.2, it correctly displays "mainnet".

This inconsistency could confuse users and should be fixed to properly show the network status for v0.4.3 providers.