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/wallet_keypool.py

@@ -156,7 +156,7 @@ class KeyPoolTest(BitcoinTestFramework):
         w1.walletpassphrase('test', 100)
 
         res = w1.sendtoaddress(address=address, amount=0.00010000)
-        nodes[0].generate(1)
+        self.generate(nodes[0], 1)
         destination = addr.pop()
 
         # Using a fee rate (10 sat / byte) well above the minimum relay rate