Open-source intro page default "don't remind for 1 month" does nothing

[rfc2822]

Steps to reproduce:

1. Uninstall DAVx5 (davx5-ose)
2. Install again
3. Go through all intro pages. Check all "Do not show anymore", except for the open-source page.
4. Open-source page appears with default: Don't remind me for 1 month.
5. Click Continue.
6. Terminate DAVx5 in tasks manager.
7. Open DAVx5 again.

Expected result:

Shouldn't remind for 1 month.

Actual result:

Open-source reminder shows again.

Further info:

Doesn't show again when I select "3 months". I assume that the default value isn't written to the settings backend when it's not clicked.

[sunkup]

Yeah, I just noticed it too 👍