Change APPENDED_LINUX_OPTIONS to LINUX_OPTIONS+=

usr/lib/sdboot-manage.conf.d/handheld-arguments

@@ -1,8 +1,5 @@
 #!/bin/bash
 
-#Send no arguments by default
-APPENDED_LINUX_OPTIONS=""
-
 #Check for legacy installs to not duplicate kernel arguments
 LEGACY=false
 if grep "fbcon=vc:2-6" /etc/sdboot-manage.conf; then
@@ -15,23 +12,23 @@ SYS_ID="$(cat /sys/devices/virtual/dmi/id/product_name)"
 #Steam Deck OLED and LCD
 if [[ ":Jupiter:Galileo:" =~ ":$SYS_ID:" ]]; then
     if ! "$LEGACY"; then
-        APPENDED_LINUX_OPTIONS="fbcon=vc:2-6 amd_iommu=off amdgpu.gttsize=8128 spi_amd.speed_dev=1 audit=0 iomem=relaxed amdgpu.ppfeaturemask=0xffffffff"
+        LINUX_OPTIONS+="fbcon=vc:2-6 amd_iommu=off amdgpu.gttsize=8128 spi_amd.speed_dev=1 audit=0 iomem=relaxed amdgpu.ppfeaturemask=0xffffffff"
     fi
 #ROG Ally
 elif [[ "$SYS_ID" =~ (ROG\ Ally).*  ]]; then
     if ! "$LEGACY"; then
-        APPENDED_LINUX_OPTIONS="fbcon=vc:2-6"
+        LINUX_OPTIONS+="fbcon=vc:2-6"
     fi
 #Lenovo legion Go
 elif [[ "$SYS_ID" =~ (83E1) ]]; then
     if ! "$LEGACY"; then
-        APPENDED_LINUX_OPTIONS="fbcon=vc:2-6 amdgpu.sg_display=0"
+        LINUX_OPTIONS+="fbcon=vc:2-6 amdgpu.sg_display=0"
     else
-        APPENDED_LINUX_OPTIONS="amdgpu.sg_display=0"
+        LINUX_OPTIONS+="amdgpu.sg_display=0"
     fi
 fi
 
 ##############
-# Unset so they dont get used by sd-boot-manager accidently
+# Unset so they dont get used by sd-boot-manager accidently (improbable but why not)
 unset LEGACY
 unset SYS_ID