fix: Fixed subRules attribute in the ZIA package

[willguibr]

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Types of changes

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• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 86.11111% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 51.44%. Comparing base (6a8f6e3) to head (c845eb7). Report is 1 commits behind head on master.

Files	Patch %	Lines
zia/services/devicegroups/devicegroups.go	85.71%	2 Missing and 1 partial :warning:
zia/services/adminuserrolemgmt/roles/adminroles.go	85.71%	1 Missing :warning:
...services/location/locationgroups/locationgroups.go	85.71%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #251 +/- ## ========================================== + Coverage 49.07% 51.44% +2.37% ========================================== Files 271 271 Lines 6780 6761 -19 ========================================== + Hits 3327 3478 +151 + Misses 3009 2820 -189 - Partials 444 463 +19 ```

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