fix page-specific placeholders when referenced with layout uris #1175
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In most situations with page area placeholders, the page uri is passed in to
groups.get
which allows the placeholder library to check the page data directly. In some cases, the initial load of the page will want to check the placeholders for page areas while technically creating placeholders for the layout (thus the layout uri will be passed in). This fixes that situation, so page areas will always get the proper placeholders.