fix gpu shareing predictor allocate more than one gpu for pod

[WingkaiHo]

Signed-off-by: yougjiahe [email protected]

Predictor patch all suitable gpu ids which return from predicateGPUbyMemory to pod. But pod only need one of suitable id of gpu. Fix https://github.com/volcano-sh/volcano/issues/2491

[WingkaiHo]

/assign @thor-wl

[volcano-sh-bot]

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