Fixes #3147 Upon deletion request, notification should be sent to uploader, not author

[maskaravivek]

Description (required)

Fixes #3147

What changes did you make and why?

Tests performed (required)

have tested the artist extraction logic externally as my username and display name is the same. https://ideone.com/iCURPU

[tests-checker]

Could you please add tests to make sure this change works as expected?

[codecov-io]

Codecov Report

Merging #3232 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master   #3232      +/-   ##
=========================================
- Coverage    6.01%   6.01%   -0.01%     
=========================================
  Files         270     270              
  Lines       11600   11605       +5     
  Branches      905     905              
=========================================
  Hits          698     698              
- Misses      10845   10850       +5     
  Partials       57      57

Impacted Files	Coverage Δ
app/src/main/java/fr/free/nrw/commons/Media.java	17.9% <0%> (-0.58%)	⬇️

---

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 8472c63...8d6b532. Read the comment docs.

[maskaravivek]

Thanks for updating the PR title @neslihanturan. :)

I will try to follow this structure in the future.