dApp - adapt channel settling to new contracts for Arbitrum

[weilbith]

Description

There are two changes by the contracts for Arbitrum in regards of the settle timeout

• the property has moved from individual channels to the token network
• the value meaning has changed from block numbers to time in seconds

In result this affects the dApp in the following way:

• the SDK does no more accept an individual settle timeout configuration value for new channels
• the channel structure of the SDK does not include the settle timeout field anymore
• the settle button of a closed channel has a countdown until it becomes settleable that needs to be adapted

Acceptance criteria

Tasks

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[weilbith]

To keep it simple and cut the time down, we have decided to remove the settleable countdown. The settle button just remains disabled until the channel becomes settleable. This is also how it was in the past. Maintaining the counter comes with a lot of challenges visually and technically. In future we might wanna tackle this "problem" again.