Fix context to Consumer instead of Provider

[Rizzet]

Description

Wrongly used ReactReduxFirebaseContext.Provider instead of ReactReduxFirebaseContext.Consumer generates an error from React when firebaseConnect() is used.
While firestoreConnect() is using ReactReduxFirebaseContext.Consumer this is probably only a typo.

Check List

If not relevant to pull request, check off as complete

• All tests passing
• Docs updated with any changes or examples if applicable
• Added tests to ensure new feature(s) work properly

Relevant Issues

[codecov]

Codecov Report

Merging #589 into next will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             next     #589   +/-   ##
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  Coverage   78.25%   78.25%           
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  Files          26       26           
  Lines         915      915           
  Branches      166      166           
=======================================
  Hits          716      716           
  Misses        199      199

[prescottprue]

That must have been changed during a cleanup, and looks like I only checked firestoreConnect. Thanks for reporting.

[prescottprue]

Released in v3.0.0-alpha.2.