targetRules field in [[allowLists]] is ignored

**Describe the bug**
Cannot ignore certain rule in the paths using extended configuration with common allowlists

**To Reproduce**
Create sample file `log.xml` in the directory:
```xml

```

Place gitleaks configuration in the same directory:
```
title = "Custom Gitleaks configuration"

[extend]
useDefault = true

[[allowlists]]
targetRules = ["generic-api-key"]
description = "Our test assets trigger false-positives"
paths = ['''log\.xml$''']
```

Scan directory
```
❯ gitleaks dir --verbose --no-banner --log-level trace
2:00PM DBG using github.com/wasilibs/go-re2 regex engine
2:00PM DBG using existing gitleaks config .gitleaks.toml from `(--source)/.gitleaks.toml`
2:00PM DBG extending config with default config
2:00PM DBG skipping file: global allowlist path=.gitleaks.toml
2:00PM TRC scanning path path=log.xml
Finding: ...e="Rename Refactor" Key="8e4f73c6-79b6-4500-aa26-55bbf2188fb4" ChangeDateTime="04/...
Secret: 8e4f73c6-79b6-4500-aa26-55bbf2188fb4
RuleID: generic-api-key
Entropy: 3.842857
File: log.xml
Line: 3
Fingerprint: log.xml:generic-api-key:3

2:00PM INF scanned ~470 bytes (470 bytes) in 37ms
2:00PM WRN leaks found: 1
```

**Expected behavior**

All findings of the rule `generic-api-key` should be ignored in the `log.xml` file.
> INF no leaks found

**Basic Info (please complete the following information):**
- OS: Windows / Linux
- Gitleaks Version: 8.27.2

**Additional context**
`targetRules` field is copy-pasted as provided in example configuration in the documentation.
If I remove the line with `targetRules`, the path is ignored
```
[[allowlists]]
description = "Our test assets trigger false-positives"
paths = ['''log\.xml$''']
```
Result is: no leaks found

cc @zricethezav

Reproduce the issue with the shown log.xml and .gitleaks.toml configuration, comparing an allowlist with and without targetRules. Trace how targetRules and paths are applied during the gitleaks directory scan; done means the generic-api-key finding in log.xml is ignored when both fields are present.

Written by the indexing model from the issue text.