[Enhancement] Render SeedQR small registration block in solid squares

[kdmukai]

fixes #483

Renders the lower-right registration block in 25x25 and 29x29 SeedQRs as solid squares instead of dots.

Before vs after:

And the same rendering improvement is continued in the zoomed-in transcription UI:

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Supplements screenshot generator with:

• 12-word, standard SeedQR WholeQRView
• 24-word, compact SeedQR WholeQRView
• 24-word, standard SeedQR WholeQRView

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Briefly tried and quickly gave up on getting the zoomed in transcription UI to render in the screenshot generator (just comes out all black). TODO for another day.

[newtonick]

ACK and Tested without issue. I'll review the code at some later time before merging.

[jdlcdl]

ACK tested.

super clean, really helps with maintaining orientation while transcribing sectors all around that alignment marker.

[kdmukai]

Fixes #381