scripted-diff: Use generate* from TestFramework

-BEGIN VERIFY SCRIPT-
 sed --regexp-extended -i \
     's/((self\.)?(nodes\[[^]]+\]|[a-z_]*(wallet|node)[0-9a-z_]*))\.(generate(|toaddress|block|todescriptor)(\(|, ))/self.\5\1, /g' \
     $(git grep -l generate ./test | grep -v 'test_framework/' | grep -v 'feature_rbf')
-END VERIFY SCRIPT-

test/functional/feature_dersig.py

@@ -72,7 +72,7 @@ class BIP66Test(BitcoinTestFramework):
         self.test_dersig_info(is_active=False)
 
         self.log.info("Mining %d blocks", DERSIG_HEIGHT - 2)
-        self.coinbase_txids = [self.nodes[0].getblock(b)['tx'][0] for b in self.miniwallet.generate(DERSIG_HEIGHT - 2)]
+        self.coinbase_txids = [self.nodes[0].getblock(b)['tx'][0] for b in self.generate(self.miniwallet, DERSIG_HEIGHT - 2)]
 
         self.log.info("Test that a transaction with non-DER signature can still appear in a block")