Change WifiScanner from system_api_service to app_api_service

This will allow the CTS get the WifiScanner to test. Also WifiScanner is
a system API and all APIs are protected by the priviliged permissions.

Bug: 339527374
Test: CtsWifiTestCases

Change-Id: Ic06a5804fa81a952e9e8792e93df489a9d47d521
diff --git a/public/service.te b/public/service.te
index e055b4e..6ba1dcc 100644
--- a/public/service.te
+++ b/public/service.te
@@ -273,7 +273,7 @@
 type wallpaper_effects_generation_service, app_api_service, system_server_service, service_manager_type;
 type webviewupdate_service, app_api_service, ephemeral_app_api_service, system_server_service, service_manager_type;
 type wifip2p_service, app_api_service, system_server_service, service_manager_type;
-type wifiscanner_service, system_api_service, system_server_service, service_manager_type;
+type wifiscanner_service, app_api_service, system_server_service, service_manager_type;
 type wifi_service, app_api_service, system_server_service, service_manager_type;
 type wifinl80211_service, service_manager_type;
 type wifiaware_service, app_api_service, system_server_service, service_manager_type;