fix: disabled attribute fallback (#1984)

Co-authored-by: Dominik Pschenitschni <mail@celement.de>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/1984
Reviewed-by: konrad <k@knt.li>
Co-authored-by: Dominik Pschenitschni <dpschen@noreply.kolaente.de>
Co-committed-by: Dominik Pschenitschni <dpschen@noreply.kolaente.de>

src/components/misc/api-config.vue

@@ -16,7 +16,7 @@
 					/>
 				</div>
 				<div class="control">
-					<x-button @click="setApiUrl" :disabled="apiUrl === '' || null">
+					<x-button @click="setApiUrl" :disabled="apiUrl === '' || undefined">
 						{{ $t('apiConfig.change') }}
 					</x-button>
 				</div>

src/components/misc/pagination.vue

@@ -6,13 +6,13 @@
 		v-if="totalPages > 1"
 	>
 		<router-link
-			:disabled="currentPage === 1 || null"
+			:disabled="currentPage === 1 || undefined"
 			:to="getRouteForPagination(currentPage - 1)"
 			class="pagination-previous">
 			{{ $t('misc.previous') }}
 		</router-link>
 		<router-link
-			:disabled="currentPage === totalPages || null"
+			:disabled="currentPage === totalPages || undefined"
 			:to="getRouteForPagination(currentPage + 1)"
 			class="pagination-next">
 			{{ $t('misc.next') }}

src/components/misc/subscription.vue

@@ -5,7 +5,7 @@
 		:icon="iconName"
 		v-tooltip="tooltipText"
 		@click="changeSubscription"
-		:disabled="disabled || null"
+		:disabled="disabled || undefined"
 	>
 		{{ buttonText }}
 	</x-button>