removed unused import.

Author: gonzalonarbaiz

OneSignalSDK/onesignal/src/main/java/com/onesignal/OneSignal.java

@@ -41,7 +41,6 @@
 import android.os.Build;
 import android.os.Bundle;
 import android.text.TextUtils;
-import android.text.format.Time;
 import android.util.Log;
 
 import androidx.annotation.NonNull;