Remove SSDRandomCrop augmentation from classification task tutorial.

[oatawa1]

What this patch does to fix the issue.

SSDRandomCrop augmentation is not compatible with classification task, thus I removed it out of the tutorial.

Link to any relevant issues or pull requests.

Closes #904

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[iizukak]

OA

[oatawa1]

@iizukak Thanks

[tfujiwar]

LGTM!!

[oatawa1]

@tfujiwar Thank you.

[oatawa1]

/ready

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