grubcfg: Remove background image, its broken with archiso 70

Signed-off-by: Peter Jung <admin@ptr1337.dev>

archiso/grub/grub.cfg

@@ -22,13 +22,9 @@ insmod udf
 insmod all_video
 insmod font
 if loadfont "${prefix}/fonts/unicode.pf2" ; then
-    insmod gfxterm
     set gfxmode="auto"
     terminal_input console
-    terminal_output gfxterm
+    terminal_output console
-    if [ -e "${cmdpath}/splash.png" ]; then
-        background_image "${cmdpath}/splash.png"
-    fi
 fi
 
 # Enable serial console