Fix Proguard Error.
Fix Proguard Error.

Fix proguard typo causing crashes when minifying the library.

Bug: 171291534
Bug: 189001730
Test: Open the samples gradle and minify to true
Test: Build and run samples using release type, and open display features sample.
Test: App should show correctly.
Change-Id: I2eecc24687e0a43ccd38fd892ad63fe2e12302cf

androidx/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx