fix(magnification): stub mock settings controller object method in IMagnificationConnectionTest

In some test cases we directly check isMagnificationSettingsShowing ==
false on mock MagnificationSettingsController object, but we should stub the
method to return false.

Bug: 377439255
Flag: EXEMPT bugfix
Test: atest IMagnificationConnectionTest
Change-Id: I3f6e5f5aef88580ada489b5d3c471172f43c513e
2 files changed