Blender Git Loki

UI: Gray out shortcut indicator in search menus

In other menus we already gray out the shortcut string, just in the search menu
that wasn't the case.

We may also want to draw other hints like this in the future, e.g. the library
name for linked data-blocks in search menus. And then it's also nicer to have
it grayed out to separate it visually from the data-block name.