[bug-fix] probeNum参数更新，loadRule生效

[578223592]

Describe what this PR does / why we need it

bug-fix

Does this pull request fix one issue?

Fixes

• https://github.com/alibaba/sentinel-golang/issues/563
• typo

Describe how you did it

add more fields for compare

Describe how to verify it

add one more test case

Special notes for reviews

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