Generated package contains wrong isToggleable value for a button

[mlewand]

📝 Provide detailed reproduction steps (if any)

The generated package contains:

view.set( {
	label: t( 'My plugin' ),
	icon: ckeditor5Icon,
	tooltip: true,
	isToggleable: true
} );

isToggleable property is wrong here as the button does not act as a toggle button.

The backstory is that during the reviews recently I've been noticing invalid isToggleable usage for a button and I was wondering where do people take this from 🙂 Turned out it's produced by package generator.

✔️ Expected result

Simply there should be no isToggleable property.

❌ Actual result

There is a isToggleable property.

❓ Possible solution

Let's simply change the template:

ckeditor5-package-generator/packages/ckeditor5-package-generator/lib/templates/src/myplugin.js

Line 24 in d57cc3e

isToggleable: true

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