fix landsattrend lake change netCDF files

[tcnichol]

The existing NetCDF files for the lake change data have geohash_id as their index rather than the id required to work with the merge and de-duplicate scripts.

2 possible fixes. One is just re-running on the data on Delta, and replacing the old netCDF files.

The other is to go through and use pandas to create dataframes and then fix the column.

Will decide which approach is better.