Fix typo in gui placeholder string

Author: guysoft

src/modules/admin-toolkit/start_chroot_script

@@ -170,10 +170,10 @@ if [ "$ADMIN_TOOLKIT_SCREEN_ROTATION" != "normal" ]
 then
     # Handle rotation if the gui module closes after this module
     echo "Adding screen rotation..."
-    if grep -q "GUI_SESSION_PLACEHOLDEFR" /home/pi/scripts/start_gui ; then
-        sed -i /home/pi/scripts/start_gui -e "s/^GUI_SESSION_PLACEHOLDEFR/export DISPLAY=:0/"
+    if grep -q "GUI_SESSION_PLACEHOLDER" /home/pi/scripts/start_gui ; then
+        sed -i /home/pi/scripts/start_gui -e "s/^GUI_SESSION_PLACEHOLDER/export DISPLAY=:0/"
         echo "/home/pi/scripts/rotate.sh $ADMIN_TOOLKIT_SCREEN_ROTATION"  >> /home/pi/scripts/start_gui
-        echo 'GUI_SESSION_PLACEHOLDEFR' >> /home/pi/scripts/start_gui
+        echo 'GUI_SESSION_PLACEHOLDER' >> /home/pi/scripts/start_gui
     elif grep -q "/home/pi/scripts/run_onepageos" /home/pi/scripts/start_gui ; then
         sed -i /home/pi/scripts/start_gui -e "s/^\/home\/pi\/scripts\/run_onepageos/export DISPLAY=:0/"
         echo "/home/pi/scripts/rotate.sh $ADMIN_TOOLKIT_SCREEN_ROTATION"  >> /home/pi/scripts/start_gui

src/modules/gui/end_chroot_script

@@ -21,7 +21,7 @@ if [ "${BASE_DISTRO}" == "raspbian" ] || [ "${BASE_DISTRO}" == "raspios64" ] ||
 fi
 
 # set the gui to run the main script of the GUI session
-sed -i "s@GUI_SESSION_PLACEHOLDEFR@${GUI_STARTUP_SCRIPT}@g" /opt/custompios/scripts/start_gui
+sed -i "s@GUI_SESSION_PLACEHOLDER@${GUI_STARTUP_SCRIPT}@g" /opt/custompios/scripts/start_gui
 
 # Set the boot target to use a gui
 systemctl set-default graphical.target

src/modules/gui/filesystem/opt/scripts/start_gui

@@ -20,4 +20,4 @@ fi
 
 matchbox-window-manager &
 
-GUI_SESSION_PLACEHOLDEFR
+GUI_SESSION_PLACEHOLDER