fix: Keep checked state background when using filled variant

[russkyc]

This fixes the checkbox checked state background being overridden when using the filled variant.

When using the filled variant of the checkbox, the checked background gets overridden by the .variant-filled background. To fix this, the .variant-filled background should only apply when the checkbox is not in a checked state.

.p-checkbox.p-variant-filled:not(.p-checkbox-checked) .p-checkbox-box {
    @apply bg-surface-50 dark:bg-surface-800
}

[vercel]

@russkyc is attempting to deploy a commit to the primetek Team on Vercel.

A member of the Team first needs to authorize it.