fix: clarify "created by" library restore message

[ormsbee]

Description

Previously, when you uploaded a backup archive to restore a library
from, it was ambiguous as to whether "created by" referred to the
person who created the original library, or the person who created
the backup archive. This re-wording clarifies that it's the person
who created the backup archive.

This will impact Studio authors creating libraries from backup files.

Screenshots

Before:

After:

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.57%. Comparing base (2930265) to head (80c8174).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2987   +/-   ##
=======================================
  Coverage   95.57%   95.57%           
=======================================
  Files        1366     1366           
  Lines       31507    31507           
  Branches     7119     7120    +1     
=======================================
  Hits        30113    30113           
+ Misses       1344     1332   -12     
- Partials       50       62   +12     

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[ormsbee]

@bradenmacdonald: thanks for the review!