Fixes #192: Update default publisher to 'openZIM'

[nida-imran173]

Description

This pull request resolves the issue by updating the default publisher from "Kiwix" to "openZIM".

Changes Made

• Updated the default publisher value to "openZIM".

Fixes https://github.com/openzim/youtube/issues/192

[nida-imran173]

fixes #192

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 1.83%. Comparing base (26f5c71) to head (c677b48).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #196 +/- ## ===================================== Coverage 1.82% 1.83% ===================================== Files 10 10 Lines 929 928 -1 Branches 147 147 ===================================== Hits 17 17 + Misses 912 911 -1 ```

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