Revert "[Fix] Work around R8 bug."

This reverts commit 1ae5a81.

Fixes: #991

Author: zhanghai

gradle.properties

@@ -16,9 +16,6 @@ org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
 # org.gradle.parallel=true
 
-# See https://issuetracker.google.com/issues/296654327 .
-android.enableR8.fullMode=false
-
 # AndroidX package structure to make it clearer which packages are bundled with the
 # Android operating system, and which are packaged with your app's APK
 # https://developer.android.com/topic/libraries/support-library/androidx-rn