fix up the lint issue

Author: nplasterer

library/src/androidTest/java/org/xmtp/android/library/ClientTest.kt

@@ -4,7 +4,6 @@ import androidx.test.ext.junit.runners.AndroidJUnit4
 import androidx.test.platform.app.InstrumentationRegistry
 import org.junit.Assert.assertEquals
 import org.junit.Assert.fail
-import org.junit.Ignore
 import org.junit.Test
 import org.junit.runner.RunWith
 import org.xmtp.android.library.messages.PrivateKeyBuilder

library/src/androidTest/java/org/xmtp/android/library/CodecTest.kt

@@ -4,7 +4,6 @@ import androidx.test.ext.junit.runners.AndroidJUnit4
 import com.google.protobuf.kotlin.toByteStringUtf8
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertTrue
-import org.junit.Ignore
 import org.junit.Test
 import org.junit.runner.RunWith
 import org.xmtp.android.library.Crypto.Companion.verifyHmacSignature