Clarify the addition of cases for LA

[deppen8]

covid-model/covid/data_us.py

Lines 34 to 36 in 094e5b3

	# From CT: On June 19th, LDH removed 1666 duplicate and non resident cases
	# after implementing a new de-duplicaton process.
	data.loc[idx["LA", pd.Timestamp("2020-06-19") :], :] += 1666

Can you clarify why you are adding cases to the LA total? Is this just to standardize with the pre-deduplication data?