Move TEST_STRUCTURE higher

This solves error in Gradle compile
e: file:///usr/local/google/home/vadimt/.sysui-studio-build-check/main/frameworks/base/packages/SystemUI/tests/src/com/android/systemui/controls/management/ControlsFavoritingActivityTest.kt:56:48 Variable 'TEST_STRUCTURE' must be initialized.

Test: presubmit
Flag: NONE Test change
Change-Id: I1621b3dc7ecf573361cd47794c19527d153cc8b2