fix(a11y): Unified search headings the sequel

Signed-off-by: Christopher Ng <chrng8@gmail.com>

core/src/views/UnifiedSearchModal.vue

@@ -1,7 +1,6 @@
 <template>
 	<NcModal id="unified-search"
 		ref="unifiedSearchModal"
-		:name="t('core', 'Unified search')"
 		:show.sync="internalIsVisible"
 		:clear-view-delay="0"
 		@close="closeModal">
@@ -12,7 +11,7 @@
 		<!-- Unified search form -->
 		<div ref="unifiedSearch" class="unified-search-modal">
 			<div class="unified-search-modal__header">
-				<h1>{{ t('core', 'Unified search') }}</h1>
+				<h2>{{ t('core', 'Unified search') }}</h2>
 				<NcInputField ref="searchInput"
 					:value.sync="searchQuery"
 					type="text"