qdbusviewer fails to send method calls using uint arguments

qdbusviewer fails to send method calls using uint arguments, if the uint argument is larger than 0. If the uint argument is 0, the call is sent and received correctly.

If the uint argument is larger than 0, the QVariant returned from the qdbusviewer property dialog is of type QVariant::Int, instead of the expected type QVariant::UInt. If the uint argument is 0, the QVariant returned from the property dialog is of type QVariant::UInt, as expected.