Previously lnworker called LNWatcher.add_channel() on these, and then LNWatcher itself decided to unwatch them.
-----
note: motivation related to https://github.com/spesmilo/electrum/pull/7932#discussion_r945755584 ,
where I have legacy (pre-staticremotekey) redeemed channels in a wallet.
Tracebacks:
```
E/W | lnwatcher.LNWalletWatcher.[default_wallet-LNW] | Exception in do_breach_remedy: AssertionError()
Traceback (most recent call last):
File "...\electrum\electrum\util.py", line 1235, in wrapper
return await func(*args, **kwargs)
File "...\electrum\electrum\lnwatcher.py", line 443, in do_breach_remedy
sweep_info_dict = chan.sweep_ctx(closing_tx)
File "...\electrum\electrum\lnchannel.py", line 264, in sweep_ctx
our_sweep_info = self.create_sweeptxs_for_our_ctx(ctx)
File "...\electrum\electrum\lnchannel.py", line 253, in create_sweeptxs_for_our_ctx
return create_sweeptxs_for_our_ctx(chan=self, ctx=ctx, sweep_address=self.sweep_address)
File "...\electrum\electrum\lnchannel.py", line 757, in sweep_address
assert self.is_static_remotekey_enabled()
AssertionError
```
```
E/W | lnwatcher.LNWalletWatcher.[default_wallet-LNW] | Exception in trigger_callbacks: AssertionError()
Traceback (most recent call last):
File "...\electrum\electrum\util.py", line 1235, in wrapper
return await func(*args, **kwargs)
File "...\electrum\electrum\lnwatcher.py", line 208, in trigger_callbacks
await callback()
File "...\electrum\electrum\lnwatcher.py", line 225, in check_onchain_situation
keep_watching = await self.do_breach_remedy(funding_outpoint, closing_tx, spenders)
File "...\electrum\electrum\util.py", line 1235, in wrapper
return await func(*args, **kwargs)
File "...\electrum\electrum\lnwatcher.py", line 443, in do_breach_remedy
sweep_info_dict = chan.sweep_ctx(closing_tx)
File "...\electrum\electrum\lnchannel.py", line 264, in sweep_ctx
our_sweep_info = self.create_sweeptxs_for_our_ctx(ctx)
File "...\electrum\electrum\lnchannel.py", line 253, in create_sweeptxs_for_our_ctx
return create_sweeptxs_for_our_ctx(chan=self, ctx=ctx, sweep_address=self.sweep_address)
File "...\electrum\electrum\lnchannel.py", line 757, in sweep_address
assert self.is_static_remotekey_enabled()
AssertionError
```
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