Modify labelImg.py to solve an error when naming the .xml file

A line was commented out because there was an error. When a box was drawn
around an object and then saved, the file had a termination
".xml.xml" instead of just ".xml".

Author: sebasrivera96

labelImg.py

@@ -768,7 +768,7 @@ def format_shape(s):
         # Can add differrent annotation formats here
         try:
             if self.usingPascalVocFormat is True:
-                annotationFilePath += XML_EXT
+                # annotationFilePath += XML_EXT
                 print ('Img: ' + self.filePath + ' -> Its xml: ' + annotationFilePath)
                 self.labelFile.savePascalVocFormat(annotationFilePath, shapes, self.filePath, self.imageData,
                                                    self.lineColor.getRgb(), self.fillColor.getRgb())