Fix download path on custom base path

[djvaldez]

This is a fix for the incorrect download URL, along the lines of #838.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 23.69%. Comparing base (4133694) to head (7dc3666).

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #889       +/-   ##
===========================================
- Coverage   56.43%   23.69%   -32.74%     
===========================================
  Files         196       96      -100     
  Lines       15601     4406    -11195     
  Branches      558        0      -558     
===========================================
- Hits         8804     1044     -7760     
+ Misses       6543     3114     -3429     
+ Partials      254      248        -6     

Flag	Coverage Δ
api	23.69% <ø> (-1.25%)	⬇️
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[kkovaletp]

I've merged this PR into #910 - a temporary alternative to the master while the project is on hold, so users still could get the latest Photoview improvements and fixes by building an image locally from this PR code

[jordy2254]

@djvaldez Can we have this PR rebased against the branch to ensure the test suite runs correctly, the linked PR broke some tests and a fix has been merged I want to be sure that they don't break again.

[kkovaletp]

@jordy2254, as this PR was merged into #910 and all tests are green there, I guess that there is a high probability that they will be green in master after merge too, but if you're not sure, you can git fetch upstream pull/889/head:<new branch name>, rebase it on master, and run tests - I guess that this will be faster than waiting for the response

[kkovaletp]

This is another part of a fix for the #834. Mentioning it here for transparency from the issue perspective

[jordy2254]

Given @kkovaletp has merged this in the past and checked it I'm happy this is ok and shall merge.