chore(magnification suw): hide joystick toggle in setup wizard

Although we haven't implemented joystick feature, but the joystick
preference controller is already in the codebase, so we also add hiding
logic for joystick toggle when in setup wizard.

Bug: 340721852
Flag: NONE
Test: manually
      atest MagnificationJoystickPreferenceControllerTest
Change-Id: Ife93548583c3e82eac030e6e3aa55b9f643b055a