Fix systemd logs retrieval

systemd.go

@@ -119,11 +119,16 @@ func (u *SystemdUnit) Stop(ctx context.Context) error {
 }
 
 func (u *SystemdUnit) Logs(context.Context) []string {
+	field := sdjournal.SD_JOURNAL_FIELD_SYSTEMD_UNIT
+	if u.user {
+		field = sdjournal.SD_JOURNAL_FIELD_SYSTEMD_USER_UNIT
+	}
+
 	journal, err := sdjournal.NewJournalReader(sdjournal.JournalReaderConfig{
 		NumFromTail: bufLines,
 		Matches: []sdjournal.Match{
 			{
-				Field: sdjournal.SD_JOURNAL_FIELD_SYSTEMD_UNIT,
+				Field: field,
 				Value: u.unit,
 			},
 		},