fix: migrations created_by

[KamilPawel]

Description

How Has This Been Tested?

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have linked this PR to a ZenHub Issue.

---

This change is 

[faucomte97]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @KamilPawel)

[faucomte97]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @KamilPawel)

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aimmo/migrations/0030_update_created_by.py line 7 at r2 (raw file):

def populate_created_by(apps, schema_editor):
    Game = apps.get_model("aimmo", "Game")
    Teacher = apps.get_model("common", "Teacher")

Do you need this??

[faucomte97]

Reviewed 1 of 1 files at r3, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @KamilPawel)

[codecov]

Codecov Report

Merging #1712 (6fa8b7e) into master (37c26ba) will increase coverage by 21.63%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #1712       +/-   ##
===========================================
+ Coverage   66.32%   87.95%   +21.63%     
===========================================
  Files         179       38      -141     
  Lines        3661     1046     -2615     
  Branches      255      109      -146     
===========================================
- Hits         2428      920     -1508     
+ Misses       1201      103     -1098     
+ Partials       32       23        -9     

Impacted Files	Coverage Δ
aimmo/migrations/0030_update_created_by.py
aimmo/migrations/0015_game_worksheet.py
..._frontend/src/redux/features/AvatarWorker/epics.js
aimmo/migrations/0004_auto_20160808_1511.py
aimmo/avatar_examples/health_seeker_avatar.py
aimmo/setup.py
game_frontend/src/components/Code/index.js
example_project/settings.py
...ame_frontend/src/babylon/entities/avatarManager.ts
aimmo/migrations/0013_alter_game_can_play.py
... and 133 more