[hotfix] Correct Senate classes in constants.py

[lbeaufort]

Per @PaulClark2:
"I did find a mistake in the Senate classes but not with Texas. Texas was correctly in Class 1. Here's the correct class information. I've corrected this in FECP. We'll need to correct it constants.py."

'1': ['AZ', 'CA', 'CT', 'DE', 'FL', 'HI', 'IN', 'ME', 'MD', 'MA', 'MI', 'MN', 'MS', 'MO', 'MT', 'NE', 'NV', 'NJ', 'NM', 'NY', 'ND', 'OH', 'PA', 'RI', 'TN', 'TX', 'UT', 'VT', 'VA', 'WA', 'WV', 'WI', 'WY'],

'2': ['AL', 'AK', 'AR', 'CO', 'DE', 'GA', 'ID', 'IL', 'IA', 'KS', 'KY', 'LA', 'ME', 'MA', 'MI', 'MN', 'MS', 'MT', 'NE', 'NH', 'NJ', 'NM', 'NC', 'OK', 'OR', 'RI', 'SC', 'SD', 'TN', 'TX', 'VA', 'WV', 'WY'],

'3': ['AL', 'AK', 'AZ', 'AR', 'CA', 'CO', 'CT', 'FL', 'GA', 'HI', 'ID', 'IL', 'IN', 'IA', 'KS', 'KY', 'LA', 'MD', 'MO', 'NV', 'NH', 'NY', 'NC', 'ND', 'OH', 'OK', 'OR', 'PA', 'SC', 'SD', 'UT', 'VT', 'WA', 'WI']

[PaulClark2]

I'd like to make this a hotfix instead of waiting for our next release. A number of states in Classes 2 and 3 where wrong in FECP. I've corrected the data in FECP.