4e0613369f446b0a57783bf9e7258fec6c474981 qt: Elide long strings in their middle in the Peers tab (Hennadii Stepanov)
Pull request description:
The eliding of long addresses (Onion v3 etc) in the Peers tab in their middle was [discussed](https://github.com/bitcoin-core/gui/issues/262#issuecomment-810490396) in #262.
On master (f0fa32450ec35056b3e1025262aeaef4a24c35ee):

With this PR:

This PR suggests the minimal diff to achieve the goal. OTOH, this change in behavior is common for all columns in the Peers table, but it seems harmless.
ACKs for top commit:
jarolrod:
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promag:
Code review ACK 4e0613369f446b0a57783bf9e7258fec6c474981.
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