Adjust keep rule class type interface to match annotation classes

Bug: 206656057
Change-Id: Ic9bba328fbb560e4642505668d40222b40fbe123
diff --git a/src/main/java/com/android/tools/r8/shaking/ProguardClassType.java b/src/main/java/com/android/tools/r8/shaking/ProguardClassType.java
index c9ab49b..de70c89 100644
--- a/src/main/java/com/android/tools/r8/shaking/ProguardClassType.java
+++ b/src/main/java/com/android/tools/r8/shaking/ProguardClassType.java
@@ -28,7 +28,7 @@
   INTERFACE {
     @Override
     public boolean matches(DexClass clazz) {
-      return clazz.accessFlags.isInterface() && !clazz.accessFlags.isAnnotation();
+      return clazz.accessFlags.isInterface();
     }
   },
   UNSPECIFIED {