
This should help in rare hardware-specific situations where the root is not automatically detected properly. We search using a marker file. This should help some weird UEFI setups where the root is set to `(hd0,msdos2)` by default. Defaulting to `(hd0)` by looking for the ESP **will break themeing**. It is unclear why, but files in `(hd0,msdos2)` are not all present as they should be. This also fixes an issue introduced with cb5c4fcd3c5d4070f040d591b2dd1da580f234d1 where rEFInd stopped booting in many cases. This is because it ended up using (hd0) rather than using the `search` which was happening beforehand, which in turn uses (hd0,msdos2), which is the ESP. Putting back the `search` here fixes that. (cherry picked from commit 20b023b5ea63a6513a4dce7f162736a00bce5cc8)
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