updating config.json

Author: jagdish-15

exercises/practice/poker/.meta/config.json

@@ -29,8 +29,6 @@
       "src/test/java/PokerTest.java"
     ],
     "example": [
-      ".meta/src/reference/java/Card.java",
-      ".meta/src/reference/java/Hand.java",
       ".meta/src/reference/java/Poker.java"
     ],
     "invalidator": [