lnwatcher: do not get_transaction before broadcast

this workaround was inserted to avoid losing the interface
when rebroadcasting a transaction already in the mempool
many times. but since the network should make sure we always
have a interface ready, and this problem shouldn't happen on
mainnet, remove the workaround

electrum/lnwatcher.py

@@ -182,7 +182,7 @@ class LNWatcher(PrintError):
             encumbered_sweep_txns = self.sweepstore[funding_outpoint][prev_txid]
         if len(encumbered_sweep_txns) == 0:
             if self.get_tx_mined_depth(prev_txid) == TxMinedDepth.DEEP:
-                self.print_error(e_tx.name, 'have no follow-up transactions and prevtx mined deep, returning')
+                self.print_error('have no follow-up transactions and prevtx', prev_txid, 'mined deep, returning')
                 return False
         # check if any response applies
         keep_watching_this = False
@@ -225,13 +225,6 @@ class LNWatcher(PrintError):
         height = self.addr_sync.get_tx_height(e_tx.tx.txid()).height
         if height != TX_HEIGHT_LOCAL:
             return
-        try:
-            await self.network.get_transaction(e_tx.tx.txid())
-        except:
-            pass
-        else:
-            self.print_error('already published, returning')
-            return
         try:
             txid = await self.network.broadcast_transaction(e_tx.tx)
         except Exception as e: