SystemUI: theme: Override modulated dark QS background color

Similar to how we handle other modulated surface colors, override our
new dark QS background color for performance (no need to modulate the
color when inflating views at runtime) and consistency (reduced
dependency on framework-side color code, which may not follow user
preferences).

Change-Id: I8e49084f31c95dfd1682ba9144ad543b9e08479e

packages/SystemUI/src/org/protonaosp/systemui/theme/CustomThemeOverlayController.kt

@@ -137,6 +137,9 @@ class CustomThemeOverlayController @Inject constructor(
 
                 // surface highlight dark = neutral1 650 (L* 35)
                 colorsList[0][650]?.let { setColor("surface_highlight_dark", it) }
+
+                // surface_header_dark_sysui = neutral1 950 (L* 5)
+                colorsList[0][950]?.let { setColor("surface_header_dark_sysui", it) }
             }
 
             build()