[Infra] Fix PR template missing a whitespace

[SigureMo]

PR Category

Environment Adaptation

PR Types

Bug fixes

Description

修复 #66905 修改的模板和检查脚本不一致导致默认情况下 CheckPRTemplate 总是失败的问题，模板里最右多删了一个空格，与检查脚本里删掉注释的模板不匹配，所以这段注释总是不能被删掉，就会出现如下错误（https://xly.bce.baidu.com/paddlepaddle/paddle/newipipe/detail/11253572/job/27101393）：

ERROR MESSAGE: PR Category should be in ['User Experience', 'Execute Infrastructure', 'Operator Mechanism', 'CINN', 'Custom Device', 'Performance Optimization', 'Distributed Strategy', 'Parameter Server', 'Communication Library', 'Auto Parallel', 'Inference', 'Environment Adaptation']. but now is [<!-- one of [ user experience | execute infrastructure | operator mechanism | cinn | custom device | performance optimization | distributed strategy | parameter server | communication library | auto parallel | inference | environment adaptation] -->user experience.].

检测到的部分包含了没能删掉的注释 [<!-- one of [ user experience | execute infrastructure | operator mechanism | cinn | custom device | performance optimization | distributed strategy | parameter server | communication library | auto parallel | inference | environment adaptation] -->user experience.]

相关 PR 补充空格后通过

（其实这里的检查逻辑完全可以直接匹配所有注释并删掉的……）

PCard-66972

[paddle-bot]

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