Remove libCompatMode from library.json

Specifying libCompatMode in library.json prevents projects from overriding the library compatibility mode as needed. This prevents the library from being used in builds where Arduino is a component to ESP-IDF.

library.json

@@ -22,9 +22,6 @@
     "espressif32",
     "libretiny"
   ],
-  "build": {
-    "libCompatMode": 2
-  },
   "export": {
     "include": [
       "examples",
@@ -35,4 +32,4 @@
       "README.md"
     ]
   }
-}
+}