Fix bug #1078

[haodi19]

Description

To fix this bug, I first modify the path "dest" in ZipToPdf.java in method convertZipToPDF. Secondly, I add a method deleteTempImages to delete temporary images generated during conversion, and this will be invoked after converting images to PDF files

Fixes #1078

Type of change

Just put an x in the [] which are valid.

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.

• [x] ./gradlew assembleDebug assembleRelease
• [x] ./gradlew checkstyle

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings

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