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.
#include <qt/networkstyle.h>
#include <qt/guiconstants.h>
#include <QApplication>
static const struct {
    const char *networkId;
    const char *appName;
    const int iconColorHueShift;
    const int iconColorSaturationReduction;
    const char *titleAddText;
} network_styles[] = {
    {"main", QAPP_APP_NAME_DEFAULT, 0, 0, ""},
    {"test", QAPP_APP_NAME_TESTNET, 70, 30, QT_TRANSLATE_NOOP("SplashScreen", "[testnet]")},
    {"regtest", QAPP_APP_NAME_TESTNET, 160, 30, "[regtest]"}
};
static const unsigned network_styles_count = sizeof(network_styles)/sizeof(*network_styles);
NetworkStyle::NetworkStyle(const QString &_appName, const int iconColorHueShift, const int iconColorSaturationReduction, const char *_titleAddText):