Picobot autograder: removed redundant map, rename extraMap -> stalactiteMap
Picobot autograder: removed redundant map, rename extraMap -> stalactiteMap

Before, there was an "extraMap" and "map3" that were the same map
So, one was removed, and the remaining one was renamed to stalactiteMap
since that is how it is referred to in the assignment

noellekimiko/HMC-Grader,noellekimiko/HMC-Grader,CSGreater-Developers/HMC-Grader,CSGreater-Developers/HMC-Grader,CSGreater-Developers/HMC-Grader,noellekimiko/HMC-Grader,noellekimiko/HMC-Grader,noellekimiko/HMC-Grader,CSGreater-Developers/HMC-Grader,CSGreater-Developers/HMC-Grader,noellekimiko/HMC-Grader