fix attribute coercion for contenteditable (#1025)

Co-authored-by: Dominik Pschenitschni <mail@celement.de>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/1025
Reviewed-by: konrad <k@knt.li>
Co-authored-by: dpschen <dpschen@noreply.kolaente.de>
Co-committed-by: dpschen <dpschen@noreply.kolaente.de>

src/components/tasks/partials/heading.vue

@@ -7,7 +7,7 @@
 			:class="{'disabled': !canWrite}"
 			@blur="save($event.target.textContent)"
 			@keydown.enter.prevent.stop="$event.target.blur()"
-			:contenteditable="canWrite ? 'true' : 'false'"
+			:contenteditable="canWrite ? true : undefined"
 			:spellcheck="false"
 		>
 			{{ task.title.trim() }}