Remove refresh from call from import_multisig
This issue requests removing the `refresh` call from wallet2's `import_multisig` if possible:

https://github.com/monero-project/monero/blob/c8214782fb2a769c57382a999eaf099691c836e7/src/wallet/wallet2.cpp#L13892

Refreshing is a relatively expensive operation which can take considerable time, especially over tor, and the wallet should be refreshing periodically anyway, so it could make most sense to remove this call.

Otherwise I observe this call hanging on the tor network and even timing out when it may not be necessary at all.

For comparison, refresh isn't called when key images are imported, etc.