swap order of require.Equal() args

we had the order of require.Equal() arguments mixed up. it should be
(expected, actual) not the other way around

updated with

    find . -name "*_test.go" -exec gofmt -r "require.Equal(a, b) -> require.Equal(b, a)" -w '{}' \+

playlist/playlist_test.go

@@ -45,11 +45,11 @@ It has multiple lines 👍
 	after, err := store.Read(newPath)
 	require.NoError(err)
 
-	require.Equal(before.UserID, after.UserID)
-	require.Equal(before.Name, after.Name)
-	require.Equal(before.Comment, after.Comment)
-	require.Equal(before.Items, after.Items)
-	require.Equal(before.IsPublic, after.IsPublic)
+	require.Equal(after.UserID, before.UserID)
+	require.Equal(after.Name, before.Name)
+	require.Equal(after.Comment, before.Comment)
+	require.Equal(after.Items, before.Items)
+	require.Equal(after.IsPublic, before.IsPublic)
 
 	playlistIDs, err = store.List()
 	require.NoError(err)