Cleanup old boolean constexprs.

We used these as flags before we had flags, and these have been true for
about a year now.

Bug: 329464641
Test: builds
Change-Id: I8de3a05ec245788a5aa0b99d28aa36a678d12cbc
diff --git a/libs/renderengine/skia/SkiaRenderEngine.cpp b/libs/renderengine/skia/SkiaRenderEngine.cpp
index 325a911..b973211 100644
--- a/libs/renderengine/skia/SkiaRenderEngine.cpp
+++ b/libs/renderengine/skia/SkiaRenderEngine.cpp
@@ -91,7 +91,6 @@
 // Debugging settings
 static const bool kPrintLayerSettings = false;
 static const bool kGaneshFlushAfterEveryLayer = kPrintLayerSettings;
-static constexpr bool kEnableLayerBrightening = true;
 
 } // namespace
 
@@ -714,8 +713,7 @@
 
     // ...and compute the dimming ratio if dimming is requested
     const float displayDimmingRatio = display.targetLuminanceNits > 0.f &&
-                    maxLayerWhitePoint > 0.f &&
-                    (kEnableLayerBrightening || display.targetLuminanceNits > maxLayerWhitePoint)
+                    maxLayerWhitePoint > 0.f && display.targetLuminanceNits > maxLayerWhitePoint
             ? maxLayerWhitePoint / display.targetLuminanceNits
             : 1.f;