[cozy-lib] Fix malformed retrieval of cozyConfig (#1348)

A malformed access to the global context was preventing some helm charts
from rendering correctly.

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## What this PR does

This patch fixes the issue.

### Release note

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```release-note
[cozy-lib] Fix malformed retrieval of cozyConfig in cozy-lib template.
```

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-->

## Summary by CodeRabbit

* **Bug Fixes**
* Corrected configuration lookup for the network setting that controls
disabling LoadBalancer node ports, ensuring defaults are applied when
config is absent and behavior reflects enabled components.
* **Refactor**
* Simplified configuration retrieval path to use the root context for
more reliable evaluation.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/library/cozy-lib/templates/_network.tpl

@@ -13,7 +13,7 @@ in use and returns `true`.
 
 {{- define "cozy-lib.network.disableLoadBalancerNodePorts" }}
 {{-   include "cozy-lib.loadCozyConfig" (list "" .) }}
-{{-   $cozyConfig := index . 1 "cozyConfig" }}
+{{-   $cozyConfig := index . "cozyConfig" }}
 {{-   if not $cozyConfig }}
 {{-     include "cozy-lib.network.defaultDisableLoadBalancerNodePorts" . }}
 {{-   else }}