[BUG] Corner radius at don't get picked up by noctalia settings sync

[inkurey-22]

Submission checklist

• I have searched existing issues and confirmed this is not a duplicate.
• I am using the latest available version of noctalia-greeter.

Bug description

If in Noctalia settings, the corner radius is set to 0, it doesn't get exported to /var/lib/noctalia-greeter/sync.toml.

The corners are then rounded to a default value.

Different from #89, since it's not related to the manual config

Steps to reproduce

1. In noctalia settings, set appearance -> corner roundness to 0.00
2. Sync noctalia settings to greeter
3. cat /var/lib/noctalia-greeter/sync.toml
4. No corner_radius_scale` field

Expected behavior

When syncing with corner rounding at 0 from noctalia settings, a line looking like corner_radius_scale = 0 appears in /var/lib/noctalia-greeter/sync.toml

Actual behavior

When syncing with corner rounding at 0 from noctalia settings, no corner_radius_scale field is present in /var/lib/noctalia-greeter/sync.toml

Logs / error output

noctalia-greeter version

1.1.0-1

Distribution

Arch-based

Environment information

Installation method: CachyOS Repos


18:36:35 $ printf "With corner rounding at 0.20\n\n" && head /var/lib/noctalia-greeter/sync.toml 
With corner rounding at 0.20

# noctalia-greeter sync.toml (UI + Sync; not managed by Nix)
# [session] last, [session.power] suspend/reboot/shutdown, [[session.actions]] action/command/label/glyph
# [appearance] scheme, theme_mode, corner_radius_scale, font_family
# [appearance.palette] full color role table, [appearance.wallpaper]/[appearance.wallpapers.<connector>]
# [output] layout/transforms

[appearance]
corner_radius_scale = 0.20000000298023224
font_family = "Fira Sans"
scheme = "Synced"
curry@splatsville ~
18:37:58 $ printf "With corner rounding at 0.00\n\n" && head /var/lib/noctalia-greeter/sync.toml 
With corner rounding at 0.00

# noctalia-greeter sync.toml (UI + Sync; not managed by Nix)
# [session] last, [session.power] suspend/reboot/shutdown, [[session.actions]] action/command/label/glyph
# [appearance] scheme, theme_mode, corner_radius_scale, font_family
# [appearance.palette] full color role table, [appearance.wallpaper]/[appearance.wallpapers.<connector>]
# [output] layout/transforms

[appearance]
font_family = "Fira Sans"
scheme = "Synced"
theme_mode = "light"

Additional context

No response