yacht-exercise: Fixed file paths in the exercise config.

Author: SimaDovakin

exercises/practice/yacht/.meta/config.json

@@ -7,13 +7,13 @@
   ],
   "files": {
     "solution": [
-      "./yacht.lisp"
+      "yacht.lisp"
     ],
     "test": [
-      "./yacht-test.lisp"
+      "yacht-test.lisp"
     ],
     "example": [
-      "./.meta/example.lisp"
+      ".meta/example.lisp"
     ]
   },
   "blurb": "Score a single throw of dice in the game Yacht.",