fix:fix logrus cancel trace info

[ViolaPioggia]

fix:fix logrus cancel trace info

修复了 logrus ctx 中无 trace 信息却打印出了空值的问题

以下是前后对比

[bytedance-oss-robot]

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[CoderPoet]

@ViolaPioggia @li-jin-gou 有一个更合适的修复方案哈: #39

nonRecord 的 span，只是表示这个 span 不可变了，并非是取不到 span context 的
noopSpan 才是取不到 span context 的