tsdb: Update OOO min/max time properly after replaying m-map chunks

Without this fix, if snapshots were enabled, and wbl goes missing
between restarts, then TSDB does not recognize that there are ooo
mmap chunks on disk and we cannot query them until those chunks
are compacted into blocks.

Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com>

tsdb/head.go

@@ -836,6 +836,7 @@ func (h *Head) loadMmappedChunks(refSeries map[chunks.HeadSeriesRef]*memSeries)
 				numSamples: numSamples,
 			})
 
+			h.updateMinOOOMaxOOOTime(mint, maxt)
 			return nil
 		}