suppress brightness OSD when operating from cc

Modules/ControlCenter/Widgets/BrightnessSliderRow.qml

@@ -136,7 +136,7 @@ Row {
         value: targetBrightness
         onSliderValueChanged: function(newValue) {
             if (DisplayService.brightnessAvailable && targetDeviceName) {
-                DisplayService.setBrightness(newValue, targetDeviceName)
+                DisplayService.setBrightness(newValue, targetDeviceName, true)
             }
         }
         thumbOutlineColor: Theme.surfaceContainer

Services/DisplayService.qml

@@ -66,9 +66,11 @@ Singleton {
         }
     }
 
-    function setBrightness(percentage, device) {
+    function setBrightness(percentage, device, suppressOsd) {
         setBrightnessInternal(percentage, device)
-        brightnessChanged()
+        if (!suppressOsd) {
+            brightnessChanged()
+        }
     }
 
     function setCurrentDevice(deviceName, saveToSession = false) {