fix: avoid overriding custom button content and theme #3487
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Description
Fixes confirm dialog to not apply the text and theme values when using custom buttons. Custom buttons should not be altered, especially the content, which might contain custom elements like icons.
This might break stuff for developers that have adapted to the broken behavior, and set text and theme in addition to adding a custom button. Seeing that we did not get a bug report about this behavior so far, it might not be a very common use-case.
Fixes vaadin/flow-components#2709
Type of change