fix(#Magnification): presubmit error on WindowMagnificationManagerTest

Per b/278120809 and ag/22735382, We ignore the test case due to failure of spying for now, and the proper solution would do in future cl.

Bug: b/285017506
Test: atest WindowMagnificationManagerTest
Change-Id: Ib4a37a464b24cc75ab5ebe89531864735c22171d
Merged-In: I0cf901b40deaa8a32c28ec98e13a7f7cf7d80fca