autocomplete is not necessary on search input types

Attribute doesn't provide any functionality on `type="search"`.

Change-Id: Ibf571b100155defa7188354f85586ea6d31dc720

includes/skins/minerva.mustache

@@ -18,7 +18,7 @@
 				</div>
 				<div class="search-box">
 					<input class="search skin-minerva-search-trigger" type="search" name="search" id="searchInput"
-					   autocomplete="off" placeholder="{{placeholder}}"
+					   placeholder="{{placeholder}}"
 					   value="{{search}}">
 				</div>
 				<div>{{{searchButton}}}</div>