Make a Function to Set the hasTreasure Property

To make TreasureControllerScript able to make one of the dig spots have treasure, we need a function for it to call that changes the value of the hasTreasure variable. 

1. Below your onTriggerEnter function, create a new function called setHasTreasure.
2. Give that function a parameter called treasure of type boolean.
3. In the function, set the hasTreasure variable to whatever the treasure parameter is (either true or false).