Update espidf.py

Author: Jason2866

builder/frameworks/espidf.py

@@ -234,7 +234,7 @@ def get_MD5_hash(phrase):
             defconfig_mcu = join(ARDUINO_FRMWRK_LIB_DIR,mcu,"defconfig." + mcu)
             response = request.urlretrieve(sdkconfig_defconfig_url, defconfig_mcu)
             with open(defconfig_mcu, 'r') as f1, open(sdkconfig_src, 'w') as f2:
-		f2.write(f1.read())
+                f2.write(f1.read())
 	    with open(sdkconfig_src, 'r') as file:
 		file_lines = file.readlines()
 		for line in file_lines: