Fix issue where upload notification shows up on app start

[maskaravivek]

Description (required)

Fixes #3981

Tests performed (required)

• Tested that app doesn't show this notification when there are no pending uploads
• when an upload is started, the notification appears

[codecov-io]

Codecov Report

Merging #4099 (53165c3) into master (7d8e09f) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #4099      +/-   ##
============================================
- Coverage     10.59%   10.59%   -0.01%     
  Complexity      476      476              
============================================
  Files           343      343              
  Lines         12887    12896       +9     
  Branches       1001     1001              
============================================
  Hits           1366     1366              
- Misses        11453    11462       +9     
  Partials         68       68              

Impacted Files	Coverage Δ	Complexity Δ
...ree/nrw/commons/contributions/ContributionDao.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...java/fr/free/nrw/commons/upload/UploadService.java	0.81% <0.00%> (-0.04%)	1.00 <0.00> (ø)

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