Scale the gesture tutorial animation to work on smaller devices

The lottie animations in the gesture navigation tutorial would get cut
off due to having to crop them to smaller devices. This change uses a
matrix to correctly scale the animation such that the aspect ratio is
maintained.

Flag: ENABLE_NEW_GESTURE_NAV_TUTORIAL
Fix: 283969417
Test: Went through the tutorial on devices of different sizes and aspect
ratios and ensured that the lottie animation isn't cut off.

Change-Id: I4b4cc9e11a68daef29fa31d6a89a1c9006041937