Reduce animated QR code threshold

[wolfmcnally]

A PSBT QR code too dense to read easily on some devices. Next build of SeedTool should reduce the animation threshold further.

[shannona]

Here's what we're currently seeing:

[wolfmcnally]

Should be fixed in build 64 (forthcoming.)

[shannona]

Tested. That same simple PSBT now generates an animated psbt. And the more readable PSBT now scans quickly back into Sparrow. So success all around. Thanks!