fix: reorder import statements for consistency

Author: ya7010

examples/add_shape_example.py

@@ -2,9 +2,10 @@
 
 from pathlib import Path
 
-import tppt
 from pptx.enum.shapes import MSO_AUTO_SHAPE_TYPE
 
+import tppt
+
 
 def main():
     """Create a PowerPoint with box shapes that have background color and text."""