Fix alternative template bundles

[t-kelly]

What are you trying to accomplish with this PR?

Fixes #707

Now when you have:

• template/page.liquid
• templates/page.alternate.liquid
• scripts/templates/page.js
• scripts/templates/page.alternate.js

The following bundles are generated:

• template.page.js
• template.page.alternate.js

And the following conditions generated in snippets/style-tags.liquid:

{%- if template == 'product.alternate' -%}
<script type="text/javascript" src="{{ 'template.product.alternate.js' | asset_url }}" defer="defer"></script>
{%- else -%}
<link rel="prefetch" href="{{ 'template.product.alternate.js' | asset_url }}" as="script">
{%- endif -%} 

{%- if template == 'product' -%}
<script type="text/javascript" src="{{ 'template.product.js' | asset_url }}" defer="defer"></script>
{%- else -%}
<link rel="prefetch" href="{{ 'template.product.js' | asset_url }}" as="script">
{%- endif -%}

[lock]

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