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_backup.py

@@ -89,7 +89,6 @@ class WalletBackupTest(BitcoinTestFramework):
         # Must sync mempools before mining.
         self.sync_mempools()
         self.generate(self.nodes[3], 1)
-        self.sync_blocks()
 
     # As above, this mirrors the original bash test.
     def start_three(self, args=()):
@@ -131,13 +130,9 @@ class WalletBackupTest(BitcoinTestFramework):
     def run_test(self):
         self.log.info("Generating initial blockchain")
         self.generate(self.nodes[0], 1)
-        self.sync_blocks()
         self.generate(self.nodes[1], 1)
-        self.sync_blocks()
         self.generate(self.nodes[2], 1)
-        self.sync_blocks()
         self.generate(self.nodes[3], COINBASE_MATURITY)
-        self.sync_blocks()
 
         assert_equal(self.nodes[0].getbalance(), 50)
         assert_equal(self.nodes[1].getbalance(), 50)
@@ -166,7 +161,6 @@ class WalletBackupTest(BitcoinTestFramework):
 
         # Generate 101 more blocks, so any fees paid mature
         self.generate(self.nodes[3], COINBASE_MATURITY + 1)
-        self.sync_all()
 
         balance0 = self.nodes[0].getbalance()
         balance1 = self.nodes[1].getbalance()