test: Remove unnecessary sync_blocks in assumeutxo tests

The nodes are not connected at this point and no blocks have been mined, so it does not seem do anything

test/functional/feature_assumeutxo.py

@@ -166,8 +166,6 @@ class AssumeutxoTest(BitcoinTestFramework):
         for n in self.nodes:
             n.setmocktime(n.getblockheader(n.getbestblockhash())['time'])
 
-        self.sync_blocks()
-
         # Generate a series of blocks that `n0` will have in the snapshot,
         # but that n1 doesn't yet see. In order for the snapshot to activate,
         # though, we have to ferry over the new headers to n1 so that it

test/functional/wallet_assumeutxo.py

@@ -62,8 +62,6 @@ class AssumeutxoTest(BitcoinTestFramework):
         for n in self.nodes:
             n.setmocktime(n.getblockheader(n.getbestblockhash())['time'])
 
-        self.sync_blocks()
-
         n0.createwallet('w')
         w = n0.get_wallet_rpc("w")