[Example] Super small fix for import in HGL_SP example

[LourensT]

since _gsddmm, _gspmm have been moved to the dgl._sparse_ops module, changed this import.
Related PR: #5066

Description

Checklist

Please feel free to remove inapplicable items for your PR.

• The PR title starts with [$CATEGORY] (such as [NN], [Model], [Doc], [Feature]])
• I've leverage the tools to beautify the python and c++ code.
• The PR is complete and small, read the Google eng practice (CL equals to PR) to understand more about small PR. In DGL, we consider PRs with less than 200 lines of core code change are small (example, test and documentation could be exempted).
• Code is well-documented
• To the best of my knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change

Changes

• Fixed import of dgl.sparse -> dgl._sparse_ops in function.py for the HGL_SP example

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