Omit extra comma

Author: deadbytefpv

targets.json

@@ -1589,7 +1589,7 @@
                 "layout_file": "Generic C3 LR1121.json",
                 "overlay": {
                     "radio_rfsw_ctrl": [15,0,8,4,4,14,0,13],
-                    "power_default": 3,
+                    "power_default": 3
                 },
                 "upload_methods": ["uart", "wifi", "betaflight"],
                 "min_version": "3.5.2",