Preserve non-ASCII characters when downloading a zip

[Xpirix]

• The current PR is for the issue #338

Changes summary

• Preserve non-ASCII characters by using escape_uri_path

[codecov-commenter]

Codecov Report

Attention: 15 lines in your changes are missing coverage. Please review.

Comparison is base (a9dabb5) 36.97% compared to head (f75ffd7) 36.91%.

Files	Patch %	Lines
qgis-app/styles/tests/test_views.py	18.75%	13 Missing :warning:
qgis-app/base/views/processing_view.py	33.33%	2 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #342 +/- ## ========================================== - Coverage 36.97% 36.91% -0.06% ========================================== Files 106 106 Lines 4500 4518 +18 ========================================== + Hits 1664 1668 +4 - Misses 2836 2850 +14 ```

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