Attempting to load a wallet with an unknown descriptor causes a fatal error:

```
2022-09-06T01:51:06Z init message: Loading wallet…
2022-09-06T01:51:06Z [descriptor] Invalid descriptor: Can only have tr at top level: iostream error
2022-09-06T01:51:06Z [descriptor] Invalid descriptor: Can only have tr at top level: iostream error
2022-09-06T01:51:06Z [descriptor] Setting spkMan to active: id = 50e6032b4d1d62c020ebb6a4d0c8fafc6f01ea80f4d2a41c1a256086611636e9, type = legacy, internal = false
2022-09-06T01:51:06Z [descriptor] Setting spkMan to active: id = 7f709abbde61e8c253798375692bf41202e625ed74a65f9474d464be34fb2870, type = p2sh-segwit, internal = false
2022-09-06T01:51:06Z [descriptor] Setting spkMan to active: id = 2dc6c34099e0ca1235fc990a51042967ecbc8c8ac57062f964739cba2f451be8, type = bech32, internal = false
2022-09-06T01:51:06Z [descriptor] Setting spkMan to active: id = 8d3c63ea1ac9936e789713dc8bae857d328ff029ab9392e67c716752e9b11b0c, type = bech32m, internal = false
2022-09-06T01:51:06Z [descriptor] Releasing wallet
2022-09-06T01:51:06Z 

************************
EXCEPTION: St12out_of_range       
map::at       
bitcoin in Runaway exception       



************************
EXCEPTION: St12out_of_range       
map::at       
bitcoin in Runaway exception       

bitcoin-qt: ./checkqueue.h:204: CCheckQueue<CScriptCheck>::~CCheckQueue() [T = CScriptCheck]: Assertion `m_worker_threads.empty()' failed.
Aborted
```

> A fatal error occurred. Bitcoin Core can no longer continue safely and will quit.

To reproduce, a quick hack:

```c++
--- a/src/script/descriptor.cpp
+++ b/src/script/descriptor.cpp
@@ -1408,7 +1408,7 @@ std::unique_ptr<DescriptorImpl> ParseScript(uint32_t& key_exp_index, Span<const
         error = "Can only have addr() at top level";
         return nullptr;
     }
-    if (ctx == ParseScriptContext::TOP && Func("tr", expr)) {
+    if (ctx == ParseScriptContext::TOP && Func("trx", expr)) {
         auto arg = Expr(expr);
         auto internal_key = ParsePubkey(key_exp_index, arg, ParseScriptContext::P2TR, out, error);
         if (!internal_key) {
```
batch.reset();
    if (!complete) {
        error = _("Error Unable to read all records in the database");
        return false;
    }
    // Close this database and delete the file
    fspath db_path = fsPathFromString(m_database->Filename());
    fspath db_dir = db_path.parent_path();
    m_database->Close();
    fsremove(db_path);
    // Make new DB
    DatabaseOptions opts;
    opts.require_create = true;
    opts.require_format = DatabaseFormatSQLITE;
    DatabaseStatus db_status;
    stdunique_ptr<WalletDatabase> new_db = MakeDatabase(db_dir, opts, db_status, error);
    assert(new_db); // This is to prevent doing anything further with this . The original file was deleted, but a backup exists.
    m_databreset();
    m_database = stdmove(new_db);
    // Write existing records into the new DB
    batch = m_database->MakeBatch();
    bool began = batch->TxnBegin();
    assert(began); // This is a critical error, the new db could not be written to. The original db exists as a backup, but we should not continue execution.
    for (const auto& [key, value]  records) {
        CDataStream ss_key(key, SER_DISK, CLIENT_VERSION);
        CDataStream ss_value(value, SER_DISK, CLIENT_VERSION);
        if (!batch->Write(ss_key, ss_value)) {
            batch->TxnAbort();
            m_database->Close();
            fsremove(m_database->Filename());