Revert "MatStake Adapter Addition" (DefiLlama#15168)

Author: waynebruce0x

projects/helper/coreAssets.json

@@ -2101,7 +2101,6 @@
     "USDF": "0x2aabea2058b5ac2d339b163c6ab6f2b6d53aabed"
   },
   "matchain": {
-    "MAT": "0x44a83a012B926853DFc1BBE2ec5BEf37126067e8",
     "WBNB": "0x4200000000000000000000000000000000000006"
   },
   "fuel": {