bug: no styling on disabled "icon-only ion-button" in ion-toolbar

[jeroenklein]

Bug Report

Ionic version:
[x] 4.5.0

Current behavior:
If the disabled attribute on the icon-only ion-button is set programatically or via HTML, there is no styling to reflect this. The button cannot be clicked, but there is no indicator to show the disabled status.

Expected behavior:

On V4.4.2 everything is working fine. See https://codepen.io/jeroenklein/pen/BgoOqY

Steps to reproduce:

https://codepen.io/jeroenklein/pen/GzpRrQ

Related code:

https://codepen.io/jeroenklein/pen/GzpRrQ

Other information:

Related issues:
#18542

[KillerCodeMonkey]

should be fixed with: #18560

[ionitron-bot]

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