fix(ActiveSignings): migrate NcButton type to variant prop

The 'type' prop for color variants was removed in @nextcloud/vue
v9.0.0 in favour of the 'variant' prop.

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

src/views/Settings/ActiveSignings.vue

@@ -14,7 +14,7 @@
 					:disabled="loading">
 					{{ t('libresign', 'Auto-refresh') }}
 				</NcCheckboxRadioSwitch>
-				<NcButton type="tertiary"
+				<NcButton variant="tertiary"
 					:disabled="loading"
 					@click="refresh">
 					<template #icon>