Wrong paper sizes for DIN A/B(x) formats in "Set Page Size" dialogue

[laura-callahan]

Description

@just-Nob pointed out that the DIN A (and also DIN B) listed sizes were incorrect. They were listing 72ppi pixel values, so I've converted them to list mm values so they would be consistent across devices.

Fixes #780

Type of change

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

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

How Has This Been Tested?

Made sure that creating a PDF with size restrictions still worked.

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

• ./gradlew assembleDebug assembleRelease
• ./gradlew checkstyle

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (Didn't see anywhere else that referenced those values)
• My changes generate no new warnings

[codeclimate]

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[Swati4star]

Great @laurameck