Clear blur regions when region sampling

Bug: b/243138863
Test: existing tests pass
Change-Id: I0ef3114a15bf465ab8c1e326a157c37520f72f90
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 6b4cfa1..29186df 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -6597,6 +6597,7 @@
         // blurs is already a pretty good approximation.
         if (regionSampling) {
             settings->backgroundBlurRadius = 0;
+            settings->blurRegions.clear();
         }
         captureResults.capturedHdrLayers |= isHdrLayer(layer);