Sort order for SpamScore column

[de-es]

Describe the bug
If you sort your mails by SpamScore, it looks like the spam values are compared by string rather than by the int value.

So you get something like

0.4
1.11
10.5
11.88
2.73

Reproduction steps
Sort your mails by the SpamScore column.

Expected behavior
Mails are sorted by integer value.

0.4
1.11
2.73
10.5
11.88

Screenshots
n/a

Thunderbird (please complete the following information):

• OS: ArchLinux

Spam Score add-on (please complete the following information):

• Version: 1.5.0

Additional context
n/a

[PitWenkin]

Same for nagtive number

-99
-90
-85
-100

MacOS Sonoma 14.5
TB 128 (Plugin still works generally 👍)
SS 1.5.0