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/rpc_getblockstats.py

@@ -48,7 +48,6 @@ class GetblockstatsTest(BitcoinTestFramework):
         address = self.nodes[0].get_deterministic_priv_key().address
         self.nodes[0].sendtoaddress(address=address, amount=10, subtractfeefromamount=True)
         self.generate(self.nodes[0], 1)
-        self.sync_all()
 
         self.nodes[0].sendtoaddress(address=address, amount=10, subtractfeefromamount=True)
         self.nodes[0].sendtoaddress(address=address, amount=10, subtractfeefromamount=False)