Remove redundant modifiers from interfaces (#14843)

Signed-off-by: Wouter Born <github@maindrain.net>

bundles/org.openhab.binding.tradfri/src/main/java/org/openhab/binding/tradfri/internal/CoapCallback.java

@@ -31,7 +31,7 @@ public interface CoapCallback {
      *
      * @param data the received json structure
      */
-    public void onUpdate(JsonElement data);
+    void onUpdate(JsonElement data);
 
     /**
      * Tells the listener to set the Thing status.
@@ -40,5 +40,5 @@ public interface CoapCallback {
      * @param status The thing status
      * @param statusDetail the status detail
      */
-    public void setStatus(ThingStatus status, ThingStatusDetail statusDetail);
+    void setStatus(ThingStatus status, ThingStatusDetail statusDetail);
 }

bundles/org.openhab.binding.tradfri/src/main/java/org/openhab/binding/tradfri/internal/DeviceUpdateListener.java

@@ -32,5 +32,5 @@ public interface DeviceUpdateListener {
      * @param instanceId The instance id of the device
      * @param data the json data describing the device
      */
-    public void onUpdate(String instanceId, JsonObject data);
+    void onUpdate(String instanceId, JsonObject data);
 }