fix: Allow admin to view all draft events

[iamareebjamal]

Fixes fossasia/open-event-frontend#5254

Previously, admin could only see their draft events, now they can everyone's

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (development@3d562fa). Click here to learn what that means.
The diff coverage is 25.00%.

@@              Coverage Diff               @@
##             development    #7325   +/-   ##
==============================================
  Coverage               ?   64.08%           
==============================================
  Files                  ?      259           
  Lines                  ?    13104           
  Branches               ?        0           
==============================================
  Hits                   ?     8398           
  Misses                 ?     4706           
  Partials               ?        0           

Impacted Files	Coverage Δ
app/api/events.py	37.31% <25.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 3d562fa...8522755. Read the comment docs.