fix: offer a drive by the folder its system reads

RetroArch's folder question numbered a Batocera SHARE drive and filled
its root. A drive is now offered by its own system's BIOS folder, one
nothing names by its bios folder, and another system's is left out and
named with the options that reach it. A list or pack card setups read
too opens on those setups, in both modes.

install.ps1

@@ -11,7 +11,7 @@
 
     $ErrorActionPreference = "Stop"
     $defaultInstallUrl = "https://raw.githubusercontent.com/Abdess/retrobios/main/install.py"
-    $defaultInstallSha256 = "455524a94cfddee646331cc5b92358ef52c06f8ed23a0a73be35355efa6528ea"
+    $defaultInstallSha256 = "f7928407478aae79bd9cd7740521e5c83b4fdd26046521c1c49b2f278c3bf22d"
     $maximumInstallerBytes = 2MB
     $installerExit = 0
     $installer = if ($PSScriptRoot) { Join-Path $PSScriptRoot "install.py" } else { $null }