Corrected NUCLEO_G031K8 detect code

AGlass0fMilk · AGlass0fMilk · commit 47b42a607442 · 2020-07-31T16:29:04.000-04:00
diff --git a/targets/targets.json b/targets/targets.json
@@ -2778,7 +2778,7 @@
             "MPU"
         ],
         "detect_code": [
-            "0221"
+            "0852"
         ],
         "device_name": "STM32G031K8Tx",
         "bootloader_supported": true
