fix(force invert): don't let devs opt-out of force dark when force invert is on

Bug: 282821643
Test: manual??
Change-Id: I0a3907ede2ad5d0c895ae70d3d1ec47b0902e3b4
diff --git a/libs/hwui/RenderNode.h b/libs/hwui/RenderNode.h
index c959db3..1f3834be 100644
--- a/libs/hwui/RenderNode.h
+++ b/libs/hwui/RenderNode.h
@@ -233,6 +233,7 @@
     void syncProperties();
     void syncDisplayList(TreeObserver& observer, TreeInfo* info);
     void handleForceDark(TreeInfo* info);
+    bool shouldEnableForceDark(TreeInfo* info);
 
     void prepareTreeImpl(TreeObserver& observer, TreeInfo& info, bool functorsNeedLayer);
     void pushStagingPropertiesChanges(TreeInfo& info);