fix: toolgroups unregister (#1704)

# What does this PR do?
FAILED
tests/integration/tools/test_tools.py::test_toolsgroups_unregister[None]
- AttributeError: 'coroutine' object has no attribute 'data'

## Test Plan
LLAMA_STACK_CONFIG=fireworks pytest -s -v
tests/integration/tools/test_tools.py
---
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* #1705
* __->__ #1704

llama_stack/distribution/routers/routing_tables.py

@@ -575,7 +575,7 @@ class ToolGroupsRoutingTable(CommonRoutingTableImpl, ToolGroups):
         tool_group = await self.get_tool_group(toolgroup_id)
         if tool_group is None:
             raise ValueError(f"Tool group {toolgroup_id} not found")
-        tools = await self.list_tools(toolgroup_id).data
+        tools = (await self.list_tools(toolgroup_id)).data
         for tool in tools:
             await self.unregister_object(tool)
         await self.unregister_object(tool_group)