MB-50165 Do not force snapshot if initFlushTs is greater than mergeTs

If initFlushTs is greater than maintTs, then timekeeper will endup
in a snapshotting loop and will never come out of it

Change-Id: I627f4cda68d9b45934877771b7fb3d5e30e711e6

secondary/indexer/timekeeper.go

@@ -2493,7 +2493,7 @@ func (tk *timekeeper) checkInitStreamReadyToMerge(streamId common.StreamId,
 					mergeTs = initFlushTs
 				}
 
-				if initFlushTs.Equal2(mergeTs, false) {
+				if initFlushTs.EqualOrGreater(mergeTs, false) {
 					forceSnapshot = false
 				}