Removed customm setText for mtp devices and check for kio_mtp

Removed customm setText for mtp devices and check for kio_mtp

We are already checking if kio_mtp is installed when we build the
predicate so we don't need to check if it is installed again.

Also, the fix for "Showing the product as a name for some kind of
massive storage" will have to be delayed to 4.9.4, so removing this.