Fix DebugUI.Button not working in runtime UI

Fix https://jira.unity3d.com/browse/UUM-65457

As reported by the user, the runtime DebugUI.Button OnAction callback was not connected to the OnClick event. Conneted the event in the prefab to fix the issue.

Author: arttu-peltonen

Packages/com.unity.render-pipelines.core/Runtime/Debugging/Prefabs/Widgets/DebugUIButton.prefab

@@ -1,22 +1,12 @@
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@@ -80,25 +79,74 @@ MonoBehaviour:
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     m_LineSpacing: 1
   m_Text: Button
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@@ -143,71 +181,51 @@ MonoBehaviour:
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