test(android): TrackRef needs albumId and artistId — #2704

The queue-filter test built TrackRefs without them; they have no
defaults, so compileDebugUnitTestKotlin failed. Caught by CI on the
Android lane while I was reading the Go one.

android/app/src/test/java/com/fabledsword/minstrel/player/DropUnavailableTest.kt

@@ -13,7 +13,13 @@ import kotlin.test.assertTrue
 class DropUnavailableTest {
 
     private fun track(id: String, unavailable: Boolean = false) =
-        TrackRef(id = id, title = id, unavailable = unavailable)
+        TrackRef(
+            id = id,
+            title = id,
+            albumId = "al-1",
+            artistId = "ar-1",
+            unavailable = unavailable,
+        )
 
     private fun queue(vararg spec: Pair<String, Boolean>) =
         spec.map { (id, missing) -> track(id, missing) }