Hygiene: collapse mobile.search* into mobile.startup

MinervaNeue depends on mobile.search and mobile.search.api. These
ResourceLoader modules existed in MobileFrontend but now have been
collapsed into mobile.startup.

This patch updates Minerva's ResourceLoader module and JavaScript
references.

Bug: T210207
Depends-On: I1eae36f2927a4e0f9d1e91d604d656beb8cc33ae
Change-Id: Ied6f4873bf2550564673296e9ef4fa009ca45e5b

resources/skins.minerva.scripts/search.js

@@ -1,8 +1,10 @@
 ( function ( M ) {
-	var SearchOverlay = M.require( 'mobile.search/SearchOverlay' ),
-		SearchGateway = M.require( 'mobile.search.api/SearchGateway' ),
+	var
+		client = M.require( 'mobile.startup' ),
+		SearchOverlay = client.search.SearchOverlay,
+		SearchGateway = client.search.SearchGateway,
 		overlayManager = M.require( 'skins.minerva.scripts/overlayManager' ),
-		searchLogger = M.require( 'mobile.search/MobileWebSearchLogger' ),
+		searchLogger = client.search.MobileWebSearchLogger,
 		searchInput = $( '#searchInput' ),
 		placeholder = searchInput.attr( 'placeholder' ),
 		searchRoute = new RegExp( /\/search/ ),

skin.json

@@ -396,8 +396,6 @@
 				"mediawiki.Title",
 				"mobile.startup",
 				"skins.minerva.mainMenu",
-				"mobile.search.api",
-				"mobile.search",
 				"mediawiki.user",
 				"mediawiki.storage",
 				"mediawiki.experiments"