fix: update unit tests

app/src/androidTest/java/com/geeksville/mesh/ChannelTest.kt

@@ -1,7 +1,7 @@
 package com.geeksville.mesh
 
 import androidx.test.ext.junit.runners.AndroidJUnit4
-import com.geeksville.mesh.model.Channel
+import com.geeksville.mesh.model.ChannelSet
 import org.junit.Assert
 import org.junit.Test
 import org.junit.runner.RunWith
@@ -10,9 +10,9 @@ import org.junit.runner.RunWith
 class ChannelTest {
     @Test
     fun channelUrlGood() {
-        val ch = Channel.emulated
+        val ch = ChannelSet()
 
-        Assert.assertTrue(ch.getChannelUrl().toString().startsWith(Channel.prefix))
-        Assert.assertEquals(Channel(ch.getChannelUrl()), ch)
+        Assert.assertTrue(ch.getChannelUrl().toString().startsWith(ChannelSet.prefix))
+        Assert.assertEquals(ChannelSet(ch.getChannelUrl()), ch)
     }
 }