Preserved previous flat button

Author: Prashant-thakur77

contentcuration/contentcuration/frontend/channelList/views/Channel/CatalogFilters.vue

@@ -6,7 +6,8 @@
       v-if="isMobile"
       class="filter-button-mobile"
       :text="$tr('searchText')"
-      appearance="raised-button"
+      primary
+      appearance="flat-button"
       @click="openSidePanel"
     />