Fixed bad optimize condition

src/libs/services/scanner/impl/ScanStepScanFiles.cpp

@@ -309,7 +309,7 @@ namespace Scanner
                     _progressCallback(context.currentStepStats);
 
                     // optimize the database during scan (if we import a very large database, it may be too late to do it once at end)
-				if ((context.stats.nbChanges() % 5'000) == 0)
+                    if ((context.currentStepStats.processedElems % 1'000) == 0)
                         _db.getTLSSession().optimize();
                 }