libqmi-glib,helpers: Fix "MHI/PCIe uci devices" -> "WWAN devices"
The MHI/PCIe UCI driver was reworked into a generic WWAN subsystem before merge upstream. The if statement actually covers all WWAN drivers, not just MHI so let's make that more clear.
Cc: @loicpoulain
Edited by Stephan Gerhold