[4.1][regression] Correctly handle save2copy for menus

[zero-24]

Pull Request for Issue #37812

Summary of Changes

Restore the existing behavior before the regression caused by #37395 as well as fix the Issue from the original report

Testing Instructions

• setup a 4.1.2 site
• create 2 menus
• create one menu items for the first menu
• open that menu item in edit mode
• change the menu setting to the seccond menu
• Use the "save2copy" feature.
• the change to the menu setting is ignored
• update to 4.1.3
• repeat the steps from above
• it works
• but try it without changing the assigned menu
• it fails as the alias exists already
• apply the patch
• confirm that both cases still work as expected
• try to only change the menu item title
• save2copy
• confirm that the alias number is not just increased but followed the change to the menu title
• try to only change the alias but keep the title
• save2copy
• confirm that the alias has been updated but not the title.

Actual result BEFORE applying this Pull Request

Issues of "alias exists already" while with save2copy we have an "increment the ID" feature

Expected result AFTER applying this Pull Request

The alias will be updated as expected any by using save2copy you should not get alias dubliceted issues.

Documentation Changes Required

n.a

Mentions

@toivo
@bembelimen

Involved within the PR which caused the regression:
@anmode
@chmst
@richard67
@vorayash
@Quy

[toivo]

I have tested this item ✅ successfully on 096a742

Tested successfully in 4.1.2 upgraded to 4.1.3 and patched, using PHP 8.0.15.

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[Webdongle]

I have tested this item ✅ successfully on 096a742

Full success

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[richard67]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/37813.}

[bembelimen]

Thx