Cleanup pref.ini and change Google server file for download test

base/pref.ini

@@ -29,10 +29,6 @@ preferred_ss_client=ss-libev
 ;recognized value: ssr-libev, ssr-csharp
 preferred_ssr_client=ssr-libev
 
-;Ping method, default is tcping
-;recognized value: tcping, googleping, bingping, gstaticping
-preferred_ping_method=tcping
-
 ;Override any port in configurations and use the following one
 ;!!!DO NOT USE THIS UNLESS YOU ARE VERY SURE OF WHAT YOU ARE DOING!!!
 ;uncomment to enable this feature
@@ -77,10 +73,9 @@ custom_color_bounds=0|65536|524288|4194304|16777216
 [rules]
 ;Test files format: URL|TagName
 test_file_urls=https://download.microsoft.com/download/2/0/E/20E90413-712F-438C-988E-FDAA79A8AC3D/dotnetfx35.exe|Default
-test_file_urls=https://dl.google.com/dl/android/aosp/bonito-pd2a.190115.029-factory-aac5b874.zip|Google
+test_file_urls=https://dl.google.com/android/studio/maven-google-com/stable/offline-gmaven-stable.zip|Google
 test_file_urls=http://cachefly.cachefly.net/200mb.test|Cachefly
 test_file_urls=http://updates-http.cdn-apple.com/2019FallFCS/fullrestores/061-22552/374D62DE-E18B-11E9-A68D-B46496A9EC6E/iPhone12,1_13.1.2_17A860_Restore.ipsw|Apple
 ;Rule format: matchType|matchItem1|matchItem2|...|matchTag
 rules=match_isp|Microsoft Corporation|Google
 rules=match_isp|Google LLC|Default
-