Election data fixes

[noahmanger]

Here's a fresh issue with the things that need to be fixed with elections dates and data (consolidating https://github.com/18F/openFEC/issues/2544 , fecgov/openFEC-web-app#2227, https://github.com/18F/openFEC/issues/2428:

• Duplicative results when filtering for GA: https://fec-dev-api.app.cloud.gov/v1/elections/search/?api_key=&cycle=2018&state=GA
• States without senate elections in 2018 (e.g. Oregon, Colorado) show up as having a senate election. This is not a problem on production.
• The Alabama special senate election displays the incorrect candidates (Alabama Senate election candidates openFEC-web-app#2227)
• Texas house candidates for 2018 include two who are 2016 candidates (Espinoza and Lloyd) (https://github.com/18F/openFEC/issues/2428)
• Incorrect candidates showing up on Colorado 6th page (https://github.com/18F/FEC/issues/4387)
• Duplicate Alaska listing Bug: Alaska House link appears twice openFEC-web-app#2245
• Election search results for state does not show all districts Election results page does not list all districts openFEC-web-app#2256

[jontours]

Recording this before I forget; the issue with the Texas candidates has nothing to do with the election endpoints. I'll try to get it knocked it out with the PR but it may be a straggler.

[jontours]

Colorado issue is fixed with latest PR. I verified my work with open source information about that election (which was probably sourced from the FEC). I'm showing 5 candidates for 2018 CO 6th.
4 Democrats and 1 Republican (the incumbent).

[jontours]

And finally the issue with Texas candidates done now as well, turns out it was related to some of the other problems (but was on a unique endpoint). And as @PaulClark2 mentioned we were using the wrong column for the cycle filter.

[jontours]

After looking at the code, think the issue with Texas may not have been a problem after all, I think the front-end just needs to pass in election_full=true. I'm not sure though, maybe have to talk about that one @noahmanger @LindsayYoung.

[LindsayYoung]

Moving the TX case to its own issue