Disable reparse code for S/MIME opaque mails

* src/parsecontroller.cpp (ParseController::parse): Only
try to reparse an inline/pgp mail not S/MIME.

This caused the second verification result to be empty because
for S/MIME we are looking at binary data when verifying an
opaque message to the native to utf8 conversion would mess up
the data completely resulting in no output.

• GnuPG-Bug-Id: T6624