Fix MagnificationConnectionManagerTest#scaleSetterGetter_scaleIsOutOfRang_getNormalizeValue

The magnification's max scale value can be different depending on a
device configuration after commit [1].

This updates the test to work on any max scale value.

[1] I703f1be3d1e8b5e25d6e85b60ef4778c2898ea6c

Bug: 352139715
Flag: EXEMPT test only
Test: MagnificationConnectionManagerTest on a device with customized ro.config.max_magnification_scale value
Change-Id: If8a5b3b46d4c25e65218d062e0c15299cd11472e