config: restore redox-drm to enabled (was incorrectly suppressed)

redox-drm = "ignore" was left from earlier GPU-suppression tests.
Restored to active so the DRM/KMS display driver is included in
the full ISO image. Without it, no GPU output or SDDM compositor.

config/redbear-full.toml

@@ -59,7 +59,7 @@ redbear-iwlwifi = {}
 numad = {}
 
 # GPU/graphics stack
-redox-drm = "ignore"
+redox-drm = {}
 mesa = "ignore"
 libdrm = "ignore"
 libepoxy = "ignore"