KFX default upscale (ciromattia#1329)

Author: axu2

kindlecomicconverter/KCC_gui.py

@@ -948,6 +948,7 @@ def changeFormat(self, outputformat=None):
             GUI.chunkSizeCheckBox.setChecked(False)
         elif GUI.formats[str(GUI.formatBox.currentText())]['format'] == 'KFX':
             GUI.mozJpegBox.setCheckState(Qt.CheckState.PartiallyChecked)
+            GUI.upscaleBox.setChecked(True)
         elif not GUI.webtoonBox.isChecked():
             GUI.chunkSizeCheckBox.setEnabled(True)
         if GUI.formats[str(GUI.formatBox.currentText())]['format'] in ('CBZ', 'PDF') and not GUI.webtoonBox.isChecked():