Revert "osbase/logtree: add WithBacklogOrder"

This reverts commit 3553b240af181f5eba87ffd2af9323fa054e1967.

Reason for revert: We don't have any consumer for this API as WithStartPosition will be sufficient.

Change-Id: I6553a99d16b6f11160df31074f44431b5a6592ed
Reviewed-on: https://review.monogon.dev/c/monogon/+/4464
Tested-by: Jenkins CI
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
diff --git a/osbase/logtree/journal.go b/osbase/logtree/journal.go
index 55977bf..c6cc503 100644
--- a/osbase/logtree/journal.go
+++ b/osbase/logtree/journal.go
@@ -5,6 +5,7 @@
 
 import (
 	"errors"
+	"sort"
 	"strings"
 	"sync"
 
@@ -196,6 +197,10 @@
 		cur = cur.prevGlobal
 	}
 
+	// Reverse entries back into chronological order.
+	sort.SliceStable(res, func(i, j int) bool {
+		return i > j
+	})
 	return
 }
 
@@ -228,6 +233,10 @@
 		cur = cur.prevLocal
 	}
 
+	// Reverse entries back into chronological order.
+	sort.SliceStable(res, func(i, j int) bool {
+		return i > j
+	})
 	return
 }