Fix opening app with ZIM doesn't open ZIM

[BPerlakiH]

Fixes: #962

As mentioned in the ticket description, the easiest way to fix this issue is to disable the non-working window restore solution on macOS.

Testing: Make sure you have only 1 version of Kiwix installed. It is possible to have multiple of them (eg from: AppStore, TestFlight, local build).
and as of Apple docs:

If multiple apps register the same scheme, the app the system targets is undefined.

meaning that the clicked ZIM file might open in another version of Kiwix, if you have more than 1 installed.

[kelson42]

@rgaudin Are you able to review/test before merging?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 39.13%. Comparing base (28ee7db) to head (b13e466).

Files with missing lines	Patch %	Lines
App/App_macOS.swift	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #968      +/-   ##
==========================================
+ Coverage   37.07%   39.13%   +2.06%     
==========================================
  Files         110      110              
  Lines        6314     6311       -3     
==========================================
+ Hits         2341     2470     +129     
+ Misses       3973     3841     -132     

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[rgaudin]

Tested, works like a charm: opening a ZIM if Kiwix if not open opens Kiwix with single window of said ZIM. When opening a ZIM while Kiwix is open, it add a window with said ZIM.

[kelson42]

We should have only one window. It ahould not open a new window, it should open a new tab in existing window.

[rgaudin]

We should have only one window. It ahould not open a new window, it should open a new tab in existing window.

This is following Apple's UI guidelines

[kelson42]

This multi windows is going to endlessly create problems. I will open an issue to stop this.

[rgaudin]

This multi windows is going to endlessly create problems. I will open an issue to stop this.

This is how macOS apps behave and are expected to behave. We surely can force a single window but that's at the expense of the user experience.