Removed change to thermal library

Author: Nathanllee1

Adafruit_Thermal.py

@@ -548,11 +548,8 @@ def printBitmap(self, w, h, bitmap, LaaT=False):
 	# the Imaging Library to perform such operations before
 	# passing the result to this function.
 	def printImage(self, image_file, LaaT=False):
-		image = image_file
-
-		if isinstance(image_file, str):
-			image = Image.open(image_file)
-			
+		from PIL import Image
+		image = Image.open(image_file)
 		if image.mode != '1':
 			image = image.convert('1')