Bump Gradle toolchain of SetupCustomizationSample

We can use latest stable Android Studio to open and build it directly.

Test: Open it with latest Android Studio, and
      run `./gradlew clean && ./gradlew build`

Signed-off-by: utzcoz <utzcoz@gmail.com>
Change-Id: I62c179dc23e707a45f1679b907cf615a2251be7b
2 files changed