Fix Sega CD internal serial reading

CHANGELIST.md

@@ -43,6 +43,7 @@
 - Fix incorrect header check
 - Make protection read-only field multiline
 - Reformat Saturn internal date
+- Fix Sega CD internal serial reading
 
 ### 2.2 (2021-12-30)
 - Fix Saturn header finding

MPF.Modules/DiscImageCreator/Parameters.cs

@@ -2944,7 +2944,7 @@ namespace MPF.Modules.DiscImageCreator
                 string[] header = segaHeader.Split('\n');
                 string serialVersionLine = header[8].Substring(58);
                 string dateLine = header[1].Substring(58);
-                serial = serialVersionLine.Substring(3, 7);
+                serial = serialVersionLine.Substring(3, 8).TrimEnd('-', ' ');
                 date = dateLine.Substring(8).Trim();
 
                 // Properly format the date string, if possible