multi: fix verbose output for listsweeps and check all against wallet

Previously, the verbose output of listsweeps would fail if we did not
find some sweeps in our wallet's listtransactions output. This could be
the case for sweeps that were rbf-ed, so the endpoint would fail. This
commit also updates the listsweeps endpoint to always check against the
wallet, so that we do not return these discarded sweeps that never
confirmed.

lnrpc/walletrpc/walletkit.swagger.json

@@ -299,7 +299,7 @@
         "parameters": [
           {
             "name": "verbose",
-            "description": "Retrieve the full sweep transaction details. If false, only the sweep txids\nwill be returned.",
+            "description": "Retrieve the full sweep transaction details. If false, only the sweep txids\nwill be returned. Note that some sweeps that LND publishes will have been\nreplaced-by-fee, so will not be included in this output.",
             "in": "query",
             "required": false,
             "type": "boolean",