Some cleanup around LaunchParamsModifier.

1. Move parameter requst before parameter phase so that it's closer to
other in-params.
2. Change the way of dispatching calculate calls in
TaskLaunchParamsModifierTests so that we don't have change all tests
after changing the signature.

Bug: 175627594
Test: atest WmTests:com.android.server.wm.TaskLaunchParamsModifierTests
Test: atest WmTests:com.android.server.wm.ActivityStarterTests
Test: atest WmTests:com.android.server.wm.LaunchParamsControllerTests
Change-Id: I483bfde489bec2d99ee4ec6721779142dda52fcb