updated usb_descriptor submodule per @hathach

dhalbert · dhalbert · commit 7798eb983dd8 · 2019-04-05T11:52:38.000-04:00
diff --git a/tools/usb_descriptor b/tools/usb_descriptor
@@ -1 +1 @@
-Subproject commit e2e79566a807b7230dddbc53a103c19b2f65e2cb
+Subproject commit dac9689e274844294bbe4fd1b78defff9ff27533
