Fix launch bug in all-in-one-no-pm.py

Launching all-in-one-no-pm.py results in an error due to line 57. FontSize should be replaced with the variable font_size, to run line 57 without error.

Author: spincrisis

examples/all-in-one-no-pm.py

@@ -54,7 +54,7 @@
 draw = ImageDraw.Draw(img)
 path = os.path.dirname(os.path.realpath(__file__))
 font_size = 20
-font = ImageFont.truetype(UserFont, FontSize)
+font = ImageFont.truetype(UserFont, font_size)
 
 message = ""