1、修复assert_ocr_not_exist断言Bug2、扩展assert_ocr_exist 与 assert_ocr_not_exist断言3、优化OCR识别范围筛选方法

[Marszzz1116]

1、修复assert_ocr_not_exist断言Bug
修复在传入多个参数时，断言无效的Bug

2、扩展assert_ocr_exist 与 assert_ocr_not_exist断言
增加bbox参数，新增区域断言支持，主要用于解决当整个屏幕内容较多，干扰较大时OCR精准度过低问题

3、优化OCR识别范围筛选方法
修改了使用方法，历史调用中在区域内查找到了多个关键字会返回第一组坐标，但该结果违背了使用此方法的初衷（当结果出现多个关键词坐标时，进行范围筛选，得出我们需要的唯一坐标），这里增加了过程校验，确保最终只能返回唯一坐标

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Marszzz1116

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[deepin-ci-robot]

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