Updated SpectraFileAveraging.cs to include the ScanFilter parameter

in the MsDataScan constructor, replacing null values. This change
ensures that the ScanFilter property is properly set, improving the
accuracy and completeness of the scan data.

mzLib/SpectralAveraging/Algorithms/SpectraFileAveraging.cs

@@ -54,7 +54,7 @@ private static MsDataScan[] AverageAll(IReadOnlyCollection<MsDataScan> scans, Sp
         // create output
         MsDataScan averagedScan = new(averagedSpectrum, 1, representativeScan.OneBasedScanNumber,
             representativeScan.IsCentroid, representativeScan.Polarity, scans.Select(p => p.RetentionTime).Average(),
-            averagedSpectrum.Range, null, representativeScan.MzAnalyzer, scans.Select(p => p.TotalIonCurrent).Average(),
+            averagedSpectrum.Range, representativeScan.ScanFilter, representativeScan.MzAnalyzer, scans.Select(p => p.TotalIonCurrent).Average(),
             representativeScan.InjectionTime, null, representativeScan.NativeId);
         MsDataScan[] msDataScans = { averagedScan };
         return msDataScans;
@@ -129,7 +129,8 @@ private static MsDataScan GetAveragedDataScanFromAveragedSpectrum(MzSpectrum ave
             centralScan.IsCentroid,
             centralScan.Polarity,
             centralScan.RetentionTime,
-            averagedSpectrum.Range, null,
+            averagedSpectrum.Range,
+            centralScan.ScanFilter,
             centralScan.MzAnalyzer,
             averagedSpectrum.SumOfAllY,
             centralScan.InjectionTime,