fix: Remove location and online checks for event

[iamareebjamal]

For fossasia/open-event-frontend#4611

Now there's no need for check for the location with online events present.

location, no online - normal
location, online - mixed
no location, online - online
no location, no online - TBD

All possible states are valid

[codecov]

Codecov Report

Merging #7229 into development will increase coverage by 0.04%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development    #7229      +/-   ##
===============================================
+ Coverage        62.98%   63.02%   +0.04%     
===============================================
  Files              259      259              
  Lines            13043    13034       -9     
===============================================
  Hits              8215     8215              
+ Misses            4828     4819       -9     

Impacted Files	Coverage Δ
app/api/events.py	23.00% <ø> (+0.50%)	⬆️

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