Fix issue where original date was not being extracted correctly

[maskaravivek]

Description (required)

Fixes #1971

Uploaded this image and the upload date shows correctly:

https://commons.wikimedia.org/wiki/File:Statue_of_Angarika_Dharamapalan.jpg

[codecov-io]

Codecov Report

Merging #2438 into 2.10-release will decrease coverage by <.01%.
The diff coverage is 0%.

@@               Coverage Diff               @@
##           2.10-release   #2438      +/-   ##
===============================================
- Coverage          5.81%   5.81%   -0.01%     
===============================================
  Files               256     256              
  Lines             12166   12172       +6     
  Branches           1092    1091       -1     
===============================================
  Hits                708     708              
- Misses            11402   11408       +6     
  Partials             56      56

Impacted Files	Coverage Δ
...va/fr/free/nrw/commons/upload/UploadPresenter.java	10.98% <ø> (ø)	⬆️
...ava/fr/free/nrw/commons/upload/UploadActivity.java	0% <ø> (ø)	⬆️
.../commons/contributions/ContributionController.java	0% <0%> (ø)	⬆️
...fr/free/nrw/commons/filepicker/UploadableFile.java	2.85% <0%> (ø)
...ava/fr/free/nrw/commons/filepicker/FilePicker.java	0% <0%> (ø)	⬆️
...n/java/fr/free/nrw/commons/upload/UploadModel.java	32.73% <0%> (-0.8%)	⬇️
...va/fr/free/nrw/commons/filepicker/PickedFiles.java	0% <0%> (ø)	⬆️

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[misaochan]

Thanks @maskaravivek ! Can you rebase and submit this to master? I haven't done the update to the 2.10-release branch yet. Trying to do it at the last minute so that alpha testers can keep testing the fixes. :)

[misaochan]

Or, actually, I guess we can merge your PR into 2.10-release now that I have updated it, and then I'll update master so alpha users can get your changes. But you'll still have to fix the conflict. :)