FIX: escape ; in filename

Author: QingQiz

BmsToOsu/Converter/SampleToMp3.cs

@@ -20,6 +20,7 @@ private class FilterComplex
             (@"\", @"\\\\"),
             (@"=", @"\\\="),
             (@",", @"\,"),
+            (@";", @"\;"),
             (@"[", @"\["),
             (@"]", @"\]"),
             (@":", @"\\\:"),