Fix "Force-Fusion-Style" (#320)

Prevents getting "Segmentation Fault" when using foreground option"

src/vorta/__main__.py

@@ -40,10 +40,6 @@ def main():
     app = VortaApp(sys.argv, single_app=True)
     app.updater = get_updater()
 
-    # Force fusion style on Linux
-    if sys.platform.startswith('linux'):
-        app.setStyle('Fusion')
-
     sys.exit(app.exec_())
 
 

src/vorta/qt_single_application.py

@@ -2,6 +2,7 @@
 from PyQt5.QtNetwork import QLocalSocket, QLocalServer
 from PyQt5.QtWidgets import QApplication
 from PyQt5.QtCore import pyqtSignal
+import sys
 
 
 class QtSingleApplication(QApplication):
@@ -17,6 +18,9 @@ def __init__(self, id, *argv):
         super().__init__(*argv)
         self._id = id
 
+        if sys.platform.startswith('linux'):
+            self.setStyle('Fusion')
+
         # Is there another instance running?
         self._outSocket = QLocalSocket()
         self._outSocket.connectToServer(self._id)