Always set refresh rate change callback in scheduler

Otherwise, content fps detection never changes the panel refresh rate if
we don't use an idle timer.

Bug: 130684082
Bug: 131906818
Test: manual
Change-Id: I6248e485a0ae3de8f2253250412f7c4c4755b99a
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 8f7420f..66ccf54 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -695,13 +695,11 @@
         ALOGE("Run StartPropertySetThread failed!");
     }
 
-    if (mScheduler->isIdleTimerEnabled()) {
-        mScheduler->setChangeRefreshRateCallback(
-                [this](RefreshRateType type, Scheduler::ConfigEvent event) {
-                    Mutex::Autolock lock(mStateLock);
-                    setRefreshRateTo(type, event);
-                });
-    }
+    mScheduler->setChangeRefreshRateCallback(
+            [this](RefreshRateType type, Scheduler::ConfigEvent event) {
+                Mutex::Autolock lock(mStateLock);
+                setRefreshRateTo(type, event);
+            });
 
     mRefreshRateConfigs.populate(getHwComposer().getConfigs(*display->getId()));
     mRefreshRateStats.setConfigMode(getHwComposer().getActiveConfigIndex(*display->getId()));