Remove unused variables in FullscreenDrawParams and PreviewPositionHelper

Flag: none
Test: FullscreenDrawParamsTest
Bug: 293224095
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:d48be359b3773237ff659b660b0d7f80a3866fde)
Merged-In: Icbd71082b5278c0f9ce8a742eed25395b31d4284
Change-Id: Icbd71082b5278c0f9ce8a742eed25395b31d4284
5 files changed