[Enhancement] Update CircleModuleDrawer() to display bottom right registration box the same as the primary 3 boxes

[bitcoinprecept]

This request originated from a Seedsigner user (actually multiple users) requesting/suggestion that the QR code backup functionality display all 4 registration boxes of 25x25 and 29x29 QR codes the same. It looks like Seedsigner is using the CircleModuleDrawer() output option, and no other built-in options here quite solve the UX issue. At present, the three main boxes have a distinct square pattern and the bottom right is displayed as dots.

Target area:

Real life screenshots:

This is a very minor point but given that multiple users have noticed/complained about this over the last year, it felt prudent to highlight as an enhancement request here. A less confusing user experience when transcribing QR code backups by hand using the seedsigner would be for all 4 registration boxes to have the same appearance, distinct from the dots of the user-specific data.