[subset] Remove unnecessary workaround
diff --git a/Lib/fontTools/subset.py b/Lib/fontTools/subset.py
index b40dd8e..b0460d4 100644
--- a/Lib/fontTools/subset.py
+++ b/Lib/fontTools/subset.py
@@ -2104,7 +2104,6 @@
       return
     from fontTools.misc import xmlWriter
     writer = xmlWriter.XMLWriter(file)
-    font.disassembleInstructions = False  # Work around ttLib bug
     for tag in font.keys():
       writer.begintag(tag)
       writer.newline()