Pressing escape when escapeKey is bound to a disabled button closes the dialog

[jjbutera]

jquery-confirm version:
v3.3.2

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[X ] bug report
[ ] feature request
[ ] support request

Current behavior:
When escapeKey is bound to a button, pressing escape closes the dialog when the button is disabled

Expected behavior:
The escape key should do nothing if the button to which it's bound is disabled.

[jjbutera]

This seems pretty easy to implement in the escape key code by simply checking the disabled property
if (!this['$_' + buttonKey].prop('disabled'))

	if (buttonKey)
		if (typeof this.buttons[buttonKey] === 'undefined') {
			console.warn('Invalid escapeKey, no buttons found with key ' + buttonKey);
		} else {
			if (!this['$_' + buttonKey].prop('disabled'))
				this['$_' + buttonKey].trigger('click');
		}