fix: Remove Treeview label on the treeview header - MEED-10291 - Mees-io/meeds#4065 (#1644)

Before this change, when the translation of the Treeview label is too long it's split in 2. To fix this issue, remove the template tag where the treeview text exists. After this change, the Treeview label on the treeview header is removed.
Resolves Meeds-io/meeds#4065

Author: akhanfir

notes-webapp/src/main/webapp/vue-app/notes-treeview/components/NoteTreeviewToolbar.vue

@@ -39,9 +39,6 @@
       @filter-button-click="$root.$emit('notes-filter-open', filter)"
       @filter-expand="filterExpand = $event"
       @loading="$emit('loading', $event)">
-      <template #left>
-        <span class="text-header">{{ $t('notes.label.tree') }}</span>
-      </template>
     </application-toolbar>
     <v-tooltip v-if="!filterExpand" bottom>
       <template #activator="{ on, attrs }">