fix: Checks for is_email_overridden not working

[prateekj117]

Fixes #6565

Short description of what this resolves:

Checks for is_email_overridden not working.

Changes proposed in this pull request:

• Change spelling of is_email_overriden to is_email_overridden

Checklist

• I have read the Contribution & Best practices Guide and my PR follows them.
• My branch is up-to-date with the Upstream development branch.
• The unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

• All the functions created/modified in this PR contain relevant docstrings.

[prateekj117]

@iamareebjamal Please review.

[codecov]

Codecov Report

Merging #6566 into development will not change coverage.
The diff coverage is 0%.

@@             Coverage Diff              @@
##           development    #6566   +/-   ##
============================================
  Coverage        65.03%   65.03%           
============================================
  Files              296      296           
  Lines            15248    15248           
============================================
  Hits              9916     9916           
  Misses            5332     5332

Impacted Files	Coverage Δ
app/api/speakers.py	47.87% <0%> (ø)	⬆️

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[iamareebjamal]

If all of this was backed by tests, these silly mistakes won't happen :(