Revert "Revert "Enable R8 full mode by default for apps""

This reverts commit ba283992ef8154efcc0abdfbf01b3c904f1c5445.

Reason for revert: Resolved associated test/build failures

Bug: 215530220
Test: atest BluetoothInstrumentationTests
Test: atest RkpdAppGoogleUnitTests
Change-Id: I27ad6a4f910fa8d48a3dc122c7542f8d7667de5a
diff --git a/java/dex.go b/java/dex.go
index 7e7da00..7dd14bd 100644
--- a/java/dex.go
+++ b/java/dex.go
@@ -45,8 +45,8 @@
 		// Whether to continue building even if warnings are emitted.  Defaults to true.
 		Ignore_warnings *bool
 
-		// If true, runs R8 in Proguard compatibility mode (default).
-		// Otherwise, runs R8 in full mode.
+		// If true, runs R8 in Proguard compatibility mode, otherwise runs R8 in full mode.
+		// Defaults to false for apps, true for libraries and tests.
 		Proguard_compatibility *bool
 
 		// If true, optimize for size by removing unused code.  Defaults to true for apps,