Simplify Kotlin Wallet api

bdk-kotlin/android/src/androidTest/java/org/bitcoindevkit/bdk/AndroidLibTest.kt

@@ -1,9 +1,6 @@
 package org.bitcoindevkit.bdk
 
-import android.util.Log
 import androidx.test.ext.junit.runners.AndroidJUnit4
-import com.sun.jna.Native
-import org.junit.*
 
 import org.junit.runner.RunWith
 
@@ -16,5 +13,5 @@ import org.junit.Assert.*
  */
 @RunWith(AndroidJUnit4::class)
 class AndroidLibTest : LibTest() {
-    
+
 }