#1071 fix use camera and general permission request

[wzy1935]

Description

Changed files: Constants.java, ImageToPdfFragment.java, MainActivity.java, PermissionsUtils.java

• Changing permission requirement. Now users using the "Image to pdf" function will also require camera permission.
• Fix cancel permission feedback. Now when the user rejects to provide permissions, the popup window will show.

Fixes #1071

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
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings

[codeclimate[bot]]

Code Climate has analyzed commit db58ebe6 and detected 1 issue on this pull request.

Here's the issue category breakdown:

Category	Count
Complexity	1

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