Removes flakytest for MagnificationModeSwitchTest

In sc-dev branch, MagnificationModeSwitchTest uses flakytest annotion.
Now for the main branch, this test starts to run.

Bug: 188890599
Test: atest MagnificationModeSwitchTest
Change-Id: Icaa305d69bea2d4ae213c16722de24e6999d5696
1 file changed