Set frame rate category LOW to 30.

This makes it easier to manually test. In the future
it will be configured per device.

Bug: 300019131
Test: atest CtsSurfaceControlTestsStaging
Test: atest libsurfaceflinger_unittest

Change-Id: I3136d1a79e808b687cd8f31bd21e8769a8e999f3
diff --git a/services/surfaceflinger/Scheduler/RefreshRateSelector.cpp b/services/surfaceflinger/Scheduler/RefreshRateSelector.cpp
index 5892b2b..47c8ef9 100644
--- a/services/surfaceflinger/Scheduler/RefreshRateSelector.cpp
+++ b/services/surfaceflinger/Scheduler/RefreshRateSelector.cpp
@@ -1487,7 +1487,7 @@
         case FrameRateCategory::Normal:
             return FpsRange{60_Hz, 90_Hz};
         case FrameRateCategory::Low:
-            return FpsRange{30_Hz, 60_Hz};
+            return FpsRange{30_Hz, 30_Hz};
         case FrameRateCategory::NoPreference:
         case FrameRateCategory::Default:
             LOG_ALWAYS_FATAL("Should not get fps range for frame rate category: %s",