[BugFix] FMP - Fix missing exchange choices in equity.screener

[deeleeramone]

1. Why?:

   • The defined choices for the exchange param in, equity.screener(provider="fmp"), was not fully populating.
   • UnauthorizedError not raised in, equity.fundamental.transcripts.

2. What?:

   • UnauthorizedError now raises when an invalid API key is used for earnings transcripts.
   • All exchange choices added to __json_schema_extra__, and now populate correctly.
   • Removes "conglomerates" as a sector choice - returns nothing from FMP.

3. Impact (1-2 sentences or a bullet point list):

   • Fixes missing choices presented by openbb-api
   • More clarity for users by raising UnauthorizedError

4. Testing Done:

   • Free/bad API key.

Exchange choices after: