Display Operator Mapping Card when operator is mapped

[michalsmiarowski]

We should keep the Operator Mapping Card displayed after the operator is mapped. In that case, instead of displaying the button that opens the operator mapping modal, we should display staking provider <> operator pair that is mapped.

Figma desings: https://www.figma.com/file/Tx1lZc7us4SqCeAgbt1hBV/Threshold-Dapp?node-id=6179%3A147494

EDIT:

The designs were updated:

Figma desings: https://www.figma.com/file/Tx1lZc7us4SqCeAgbt1hBV/Threshold-Dapp?node-id=6658%3A180912