kf6-solid: fix final #error stub — SATA/IDE bus detection on Redox

The fourth and final #error stub in udisksstoragedrive.cpp was in
the bus() function's ATA SATA-vs-IDE detection block. On non-Linux
platforms without udev, this fell through to #error.

Fix: add Q_OS_REDOX guard returning Solid::StorageDrive::Sata.
Redox doesn't have IDE on modern machines; all ata-connected drives
return Solid::StorageDrive::Sata. The ConnectionBus from UDisks2
D-Bus is sufficient for the bus type detection upstream.

All 4 KF6Solid #error stubs are now resolved:
- isHotpluggable() → Q_OS_REDOX: returns isRemovable()
- bus() udevBus → Q_OS_REDOX: uses ConnectionBus from device
- bus() ATA → Q_OS_REDOX: defaults to Sata
- isAppendable() → Q_OS_REDOX: returns false (no optical)

local/recipes/kde/kf6-solid/source/src/solid/devices/backends/udisks2/udisksstoragedrive.cpp

@@ -122,6 +122,10 @@ Solid::StorageDrive::Bus StorageDrive::bus() const
         } else { // parallel (classical) ATA
             return Solid::StorageDrive::Ide;
         }
+#elif defined(Q_OS_REDOX)
+        // On Redox, ConnectionBus from UDisks2 is sufficient; default to SATA
+        // for ata-connected drives since Redox doesn't have IDE on modern machines.
+        return Solid::StorageDrive::Sata;
 #else
 #error Implement this or stub this out for your platform
 #endif