fix typo in optionsmodel.cpp

src/qt/optionsmodel.cpp

@@ -40,7 +40,7 @@ void OptionsModel::Init()
 {
     QSettings settings;
 
-    // These are QT-only settings:
+    // These are Qt-only settings:
     nDisplayUnit = settings.value("nDisplayUnit", BitcoinUnits::BTC).toInt();
     bDisplayAddresses = settings.value("bDisplayAddresses", false).toBool();
     fMinimizeToTray = settings.value("fMinimizeToTray", false).toBool();