Update check for impish

gdm3-theme is now gdm-theme...

scripts/paint-it-black.sh

@@ -41,7 +41,7 @@ sedfilter \
 
 notice "You may want to run 'update-initramfs -u -k all && update-grub' now :)"
 
-if update-alternatives --query gdm3-theme.gresource 2>/dev/null | grep '^Value: ' | grep -q '/Yaru/'
+if update-alternatives --query gdm-theme.gresource 2>/dev/null | grep '^Value: ' | grep -q '/Yaru/'
 then
-	notice "To modify the background of gdm, check 'update-alternatives --config gdm3-theme.gresource'"
+	notice "To modify the background of gdm, check 'update-alternatives --config gdm-theme.gresource'"
 fi