Remove use of Setting#getRaw in deprecation tests (#47262)

This commit removes a use of Setting#getRaw from the deprecation header
tests. The use of Setting#getRaw is not needed here, the x-content
infrastructure will take care of emitting the appropriate values here,
and so the caller does not need to convert these to string
representations of the settings values.

Author: jasontedor

qa/smoke-test-http/src/test/java/org/elasticsearch/http/TestDeprecationHeaderRestAction.java

@@ -100,7 +100,7 @@ public RestChannelConsumer prepareRequest(RestRequest request, NodeClient client
 
             builder.startObject().startArray("settings");
             for (String setting : settings) {
-                builder.startObject().field(setting, SETTINGS_MAP.get(setting).getRaw(this.settings)).endObject();
+                builder.startObject().field(setting, SETTINGS_MAP.get(setting).get(this.settings)).endObject();
             }
             builder.endArray().endObject();
             channel.sendResponse(new BytesRestResponse(RestStatus.OK, builder));