fix(kanban): do not mark first bucked as done bucket in filter bucket mode

Resolves https://github.com/go-vikunja/vikunja/issues/313

(cherry picked from commit 1a8f12ac137f20745895a5c3b828683324b82dc4)

frontend/src/components/project/views/ProjectKanban.vue

@@ -41,7 +41,7 @@
 									@click="() => unCollapseBucket(bucket)"
 								>
 									<span
-										v-if="view?.doneBucketId === bucket.id"
+										v-if="bucket.id !== 0 && view?.doneBucketId === bucket.id"
 										v-tooltip="$t('project.kanban.doneBucketHint')"
 										class="icon is-small has-text-success mr-2"
 									>