scripted-diff: test: remove 'descriptors=True' argument for createwallet calls

Descriptor wallets are already created by default since v23.0, but
since the recent legacy wallet removal this parameter *must* be True
(see commit 9f04e02ffa), i.e. still
passing it wouldn't contain any information for test readers
anymore. So simply drop them in the functional tests in order to
reduce code bloat.

-BEGIN VERIFY SCRIPT-
sed -i 's/, descriptors=True//g' $(git ls-files -- 'test/functional' ':(exclude)test/functional/wallet_backwards_compatibility.py')
sed -i '/descriptors=True,/d' ./test/functional/mempool_persist.py
-END VERIFY SCRIPT-

test/functional/wallet_fast_rescan.py

@@ -37,7 +37,7 @@ class WalletFastRescanTest(BitcoinTestFramework):
 
         self.log.info("Create descriptor wallet with backup")
         WALLET_BACKUP_FILENAME = node.datadir_path / 'wallet.bak'
-        node.createwallet(wallet_name='topup_test', descriptors=True)
+        node.createwallet(wallet_name='topup_test')
         w = node.get_wallet_rpc('topup_test')
         fixed_key = get_generate_key()
         print(w.importdescriptors([{"desc": descsum_create(f"wpkh({fixed_key.privkey})"), "timestamp": "now"}]))
@@ -66,7 +66,7 @@ class WalletFastRescanTest(BitcoinTestFramework):
         txids_fast = self.get_wallet_txids(node, 'rescan_fast')
 
         self.log.info("Import non-active descriptors with block filter index")
-        node.createwallet(wallet_name='rescan_fast_nonactive', descriptors=True, disable_private_keys=True, blank=True)
+        node.createwallet(wallet_name='rescan_fast_nonactive', disable_private_keys=True, blank=True)
         with node.assert_debug_log(['fast variant using block filters']):
             w = node.get_wallet_rpc('rescan_fast_nonactive')
             w.importdescriptors([{"desc": descriptor['desc'], "timestamp": 0} for descriptor in descriptors])
@@ -79,7 +79,7 @@ class WalletFastRescanTest(BitcoinTestFramework):
         txids_slow = self.get_wallet_txids(node, 'rescan_slow')
 
         self.log.info("Import non-active descriptors w/o block filter index")
-        node.createwallet(wallet_name='rescan_slow_nonactive', descriptors=True, disable_private_keys=True, blank=True)
+        node.createwallet(wallet_name='rescan_slow_nonactive', disable_private_keys=True, blank=True)
         with node.assert_debug_log(['slow variant inspecting all blocks']):
             w = node.get_wallet_rpc('rescan_slow_nonactive')
             w.importdescriptors([{"desc": descriptor['desc'], "timestamp": 0} for descriptor in descriptors])