SetFlagsRule: change the default behavior of SetFlagsRule

This commit changes the default behavior of SetFlagsRule from set all
flag value to null to the device value.

Bug: N/A
Test: atest FlagJUnitTests FlagJUnitHostTests
Change-Id: I7fb534f84f756c3a78a625bc0a1ac2be3fb86620
diff --git a/libraries/flag-helpers/junit/src_base/android/platform/test/flag/junit/SetFlagsRule.java b/libraries/flag-helpers/junit/src_base/android/platform/test/flag/junit/SetFlagsRule.java
index 9bcda70..fde0186 100644
--- a/libraries/flag-helpers/junit/src_base/android/platform/test/flag/junit/SetFlagsRule.java
+++ b/libraries/flag-helpers/junit/src_base/android/platform/test/flag/junit/SetFlagsRule.java
@@ -97,7 +97,7 @@
     }
 
     public SetFlagsRule() {
-        this(DefaultInitValueType.NULL_DEFAULT);
+        this(DefaultInitValueType.DEVICE_DEFAULT);
     }
 
     public SetFlagsRule(DefaultInitValueType defaultType) {