Allow aliasing on {{ seo_pro:meta_data }} tag

[amadeann]

Currently, the only way (I know of) to access "Section Defaults" or values "from field" is to do something like this:

{{ seo_pro:meta_data }}
    {{ title }}
{{ /seo_pro:meta_data }}

The above overrides the context values, which is not something you always want.

With this small change, you'll be able to do something like:

{{ seo_pro:meta_data as="seo_meta" }}
    {{ seo_meta:title }}
{{ /seo_pro:meta_data }}

which leaves the context alone.

I'm referring to these settings:

[jesseleite]

Thank you for the PR!

Love this idea, just had to fix regression / failing tests around blade 🤘