Reduce the jitter offset in dream overlay.

This change reduces the jitter offset in dream overlay by about half,
which should still be sufficient jitter to avoid screen burn-in effects.

Test: atest DreamOverlayContainerViewControllerTest
Bug: 229893428
Change-Id: Icdbf832b6a848c7085dda09708045e678fd2b313
diff --git a/packages/SystemUI/res/values/config.xml b/packages/SystemUI/res/values/config.xml
index 08f4608..e62a398 100644
--- a/packages/SystemUI/res/values/config.xml
+++ b/packages/SystemUI/res/values/config.xml
@@ -690,7 +690,7 @@
     <string name="config_communalSourceConnector" translatable="false"></string>
 
     <!-- How often in milliseconds to jitter the dream overlay in order to avoid burn-in. -->
-    <integer name="config_dreamOverlayBurnInProtectionUpdateIntervalMillis">500</integer>
+    <integer name="config_dreamOverlayBurnInProtectionUpdateIntervalMillis">1000</integer>
 
     <!-- How long in milliseconds before full burn-in protection is achieved. -->
     <integer name="config_dreamOverlayMillisUntilFullJitter">240000</integer>