feat(matter_example): change Preferences names

Author: SuGlider

libraries/Matter/examples/MatterOnOffLight/MatterOnOffLight.ino

@@ -22,8 +22,8 @@
 MatterOnOffLight OnOffLight;
 
 // it will keep last OnOff state stored, using Preferences
-Preferences statePref;
-const char *OnOffPrefKey = "OnOffState";
+Preferences matterPref;
+const char *onOffPrefKey = "OnOffState";
 
 // set your board LED pin here
 #ifdef LED_BUILTIN
@@ -49,7 +49,7 @@ bool setLightOnOff(bool state) {
     digitalWrite(ledPin, LOW);
   }
   // store last OnOff state for when the Light is restarted / power goes off
-  statePref.putBool(OnOffPrefKey, state);
+  matterPref.putBool(onOffPrefKey, state);
   // This callback must return the success state to Matter core
   return true;
 }
@@ -83,8 +83,8 @@ void setup() {
   delay(500);
 
   // Initialize Matter EndPoint
-  statePref.begin("matterLight", false);
-  bool lastOnOffState = statePref.getBool(OnOffPrefKey, true);
+  matterPref.begin("MatterPrefs", false);
+  bool lastOnOffState = matterPref.getBool(onOffPrefKey, true);
   OnOffLight.begin(lastOnOffState);
   OnOffLight.onChange(setLightOnOff);