[strip-sdh] Dashes removed incorrectly

[gizeto]

I guess it's not a common case though

Before:

00:29:37,680 --> 00:29:39,599
- [Archie] Rae?
- [chanting]
Jabba. Jabba. Jabba.

After:

00:29:37,680 --> 00:29:39,599
Rae?
Jabba. Jabba. Jabba.