Fix the #[qenum] attribute breaking compilation

[jnbooth]

For some reason, adding #[qenum(MyType)] to an enum inside of cxx_qt::bridge changes its visibility from pub to pub(super). This causes compilation errors such as "type mytype::cxx_qt_private_qenum_MyEnum::MyEnum is private" if you try to use that enum anywhere outside of the file in which it is declared. This PR changes the visibility from pub(super) to pub, fixing the issue.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (df0b5b3) to head (a6a1444).

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1420   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           75        75           
  Lines        13457     13455    -2     
=========================================
- Hits         13457     13455    -2     

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