Revert "Enable R8 full mode by default for apps"

This reverts commit 93d0bffafeac5a9c96b5921d5c48d3d78594e68b.

Reason for revert: Possible culprit for b/289285719

Change-Id: If818db9d38008ea9d8c7813b9f6fabc2975e8507
diff --git a/java/dex.go b/java/dex.go
index 7dd14bd..7e7da00 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, otherwise runs R8 in full mode.
-		// Defaults to false for apps, true for libraries and tests.
+		// If true, runs R8 in Proguard compatibility mode (default).
+		// Otherwise, runs R8 in full mode.
 		Proguard_compatibility *bool
 
 		// If true, optimize for size by removing unused code.  Defaults to true for apps,