gui: executable name set to qss-gui instead of qss

gui/gui.pro

@@ -8,7 +8,7 @@ QT       += core concurrent gui
 
 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 CONFIG += c++14
-TARGET = qss
+TARGET = qss-gui
 TEMPLATE = app
 
 # The following define makes your compiler emit warnings if you use