[SB] Disable StatusBarNoHunBehavior flag in unit test.

When the flag is on, there is no isolated icon, so it's okay to disable
the test.

Bug: 385740230
Flag: com.android.systemui.status_bar_no_hun_behavior
Test: atest StatusBarNotificationIconsInteractorTest
Change-Id: I481d9dcf565f3917934f24748a130671bf6f0d39