Update espidf.py

Author: Jason2866

builder/frameworks/espidf.py

@@ -236,7 +236,7 @@ def get_MD5_hash(phrase):
             response = request.urlretrieve(sdkconfig_defconfig_url, defconfig_mcu)
             with open(defconfig_mcu, 'r') as f1, open(sdkconfig_mcu, 'a') as f2:
                 f2.write(f1.read())
-            if mcu = "esp32c2":
+            if mcu == "esp32c2":
                 ARDUINO_C2_LIB_DIR = platform.get_package_dir("framework-arduino-c2-skeleton-lib")
                 shutil.copytree(ARDUINO_C2_LIB_DIR, ARDUINO_FRMWRK_LIB_DIR, dirs_exist_ok=True)