test: Remove unnecessary block mining from importdescriptors test

Author: fjahr

test/functional/wallet_importdescriptors.py

@@ -454,7 +454,7 @@ def run_test(self):
         send_txid = wmulti_priv.sendtoaddress(w0.getnewaddress(), 8)
         decoded = wmulti_priv.gettransaction(txid=send_txid, verbose=True)['decoded']
         assert_equal(len(decoded['vin'][0]['txinwitness']), 4)
-        self.generate(self.nodes[0], 6)
+        self.sync_all()
 
         self.nodes[1].createwallet(wallet_name="wmulti_pub", disable_private_keys=True, blank=True, descriptors=True)
         wmulti_pub = self.nodes[1].get_wallet_rpc("wmulti_pub")