list-view: Dim fts snippet with alpha, not color.

Merged António Fernandes requested to merge list-view-dim-fts-snippet-with-alpha into master

The full text search snippet shares the cell with the finename, as a single string. Therefore, we cannot rely on the dim-label style, so we set it's color to grey using Pango markup.

But hardcoding colors is bad for theming.

Instead, use alpha transparency to dim fts snippet in a color-agnostic way.

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