[gui][displayComponents] Add .h5 as default suffix at fileDialog for saving components

darfix/gui/displayComponentsWidget.py

@@ -170,6 +170,7 @@ class DisplayComponentsWidget(qt.QMainWindow):
         fileDialog.setFileMode(fileDialog.AnyFile)
         fileDialog.setAcceptMode(fileDialog.AcceptSave)
         fileDialog.setOption(fileDialog.DontUseNativeDialog)
+        fileDialog.setDefaultSuffix(".h5")
         if fileDialog.exec_():
             write_process(fileDialog.selectedFiles()[0], 'entry',
                           self.dimensions, self.W, self.components, 1)