refactor(magnification): Renaming ControllerSupplier as WindowMagnificationControllerSupplier

Renaming the class to make the usage more specific.

Bug: 310109308
Test: atest SystemUITests:MagnificationTest
      atest SystemUITests:IWindowMagnificationConnectionTest
Flag: NA
Change-Id: Iaf044841db20787246be6a611a44c86f8cb91797
3 files changed