Add gnomeball speculation to grid master board

Author: adamgraham

src/data/grid_master_tiles.json

@@ -202,6 +202,9 @@
     "col": "C",
     "row": "4",
     "type": "easy",
+    "icon": "Gnomeball",
+    "task": "SPECULATION – Win a Gnomeball match.",
+    "taskLink": "Gnomeball",
     "reward": "Dodgy Deals",
     "rewardDescription": "SPECULATION",
     "rewardIcon": "Dodgy_Deals",