Stop overriding preferences in WebKitTestRunner that don't need to be
Created attachment 411116 [details] Patch
<rdar://problem/70440980>
Is this now needed - https://searchfox.org/wubkat/rev/ec7b70f81292aa1f739bc9adf1af7f0954c89003/Tools/WebKitTestRunner/TestController.cpp#1068