scripted-diff: Remove redundant sync_all and sync_blocks

The sync calls are redundant after a call to generate, because generate
already syncs itself.

-BEGIN VERIFY SCRIPT-
perl -0777 -pi -e 's/(generate[^\n]*\)[^\n]*)(\n|\s)+self.sync_(all|blocks)\([^\)]*\)\n/\1\n/g' $(git grep -l generate ./test)
-END VERIFY SCRIPT-

test/functional/wallet_import_rescan.py

@@ -189,7 +189,6 @@ class ImportRescanTest(BitcoinTestFramework):
             self.nodes[0].getblockheader(self.nodes[0].getbestblockhash())["time"] + TIMESTAMP_WINDOW + 1,
         )
         self.generate(self.nodes[0], 1)
-        self.sync_all()
 
         # For each variation of wallet key import, invoke the import RPC and
         # check the results from getbalance and listtransactions.