On Fedora 29.1-2, when running `bitcoin-qt -regtest`, the name of the application in the menu bar is shown as `Bitcoin-Qt-testnet` (the icon is the correct blue colour). i.e:
![fedora - notifications](https://user-images.githubusercontent.com/863730/50596726-23f17280-0ee0-11e9-9083-31c8baf62feb.png)


Noticed while testing #15000 (confirmed unrelated by testing master). When running just `bitcoin-qt`, or passing `-testnet` the menu name and icon are both correct.
{
                    s -= iconColorSaturationReduction;
                }
                col.setHsl(h,s,l,a);
                /
                scL[x] = col.rgba();
            }
        }
        /
        pixmap.convertFromImage(img);
    }
    appIcon             = QIcon(pixmap);
    trayAndWindowIcon   = QIcon(pixmap.scaled(QSize(256,256)));
}
const NetworkStyle *NetworkStyle::instantiate(const QString &networkId)
{
    for (unsigned x=0; x<network_styles_count; ++x)
    {
        if (networkId == network_styles[x].networkId)
        {
            return new NetworkStyle(
                    network_styles[x].appName,
                    network_styles[x].iconColorHueShift,
                    network_styles[x].iconColorSaturationReduction,
                    network_styles[x].titleAddText);
        }
    }
    return 0;
}