Format change at "Mobile network type" value

Remove "network type Number" from "mobile network type" value
at "About Phone > Status".

For example value "UNKNOWN:0" became "UNKNOWN"
(if value is "UNKNOWN", the word is localized)

The number ":0" did not add much value to the user.

Change-Id: Iee29fa2ab42f2d6eab5d9dbd6f647087ee382648