[ALOY-1721] Styles: Alloy global can no longer be accessed in styles

Description

SDK 9 removes the implicit global scope in app.js. We tried to handle this in ALOY-1633, but there was an oversight that the Alloy global can be used in styles which does not get touched by the babel plugin. We need to either figure out how we can inject Alloy if needed, or just fallback to forcing the Alloy global to exist

Steps to reproduce

1. Copy the below contents to the right files

Alloy.Globals.color = 'blue'

<Alloy>
	<Window id="win" onClick="onClick">
		<Label text="foo"/>
	</Window>
</Alloy>

function onClick() {
	$.UI.create('Window');
}
$.win.open();

'Window': {
	backgroundColor: Alloy.Globals.color
}

2. Build for any platform/device 3. Tap the window

Actual

Runtime error

Expected

Blue window with the label foo