Fix FATAL message for invalid recovery timeline at beginning of recovery

If the requested recovery timeline is not reachable, the logged
checkpoint and timeline should to be the values read from the
backup_label when it is defined.  The message generated used the values
from the control file in this case, which is fine when recovering from
the control file without a backup_label, but not if there is a
backup_label.

Issue introduced in ee99427.  v15 has introduced xlogrecovery.c and
more simplifications in this area (4a92a1c, a27048c), making
this change a bit simpler to think about, so backpatch only down to this
version.

Author: David Steele <david@pgbackrest.org>
Reviewed-by: Andrey M. Borodin <x4mmm@yandex-team.ru>
Reviewed-by: Benoit Lobréau <benoit.lobreau@dalibo.com>
Discussion: https://postgr.es/m/c3d617d4-1696-4aa7-8a4d-5a7d19cc5618@pgbackrest.org
Backpatch-through: 15

Author: michaelpq

src/backend/access/transam/xlogrecovery.c

@@ -845,13 +845,13 @@ InitWalRecovery(ControlFileData *ControlFile, bool *wasShutdown_ptr,
 		 * tliSwitchPoint will throw an error if the checkpoint's timeline is
 		 * not in expectedTLEs at all.
 		 */
-		switchpoint = tliSwitchPoint(ControlFile->checkPointCopy.ThisTimeLineID, expectedTLEs, NULL);
+		switchpoint = tliSwitchPoint(CheckPointTLI, expectedTLEs, NULL);
 		ereport(FATAL,
 				(errmsg("requested timeline %u is not a child of this server's history",
 						recoveryTargetTLI),
 				 errdetail("Latest checkpoint is at %X/%X on timeline %u, but in the history of the requested timeline, the server forked off from that timeline at %X/%X.",
-						   LSN_FORMAT_ARGS(ControlFile->checkPoint),
-						   ControlFile->checkPointCopy.ThisTimeLineID,
+						   LSN_FORMAT_ARGS(CheckPointLoc),
+						   CheckPointTLI,
 						   LSN_FORMAT_ARGS(switchpoint))));
 	}