fix(al2023/nvidia): Remove incorrect assignment of variable (#2504)

`EC2_GRID_DRIVER_S3_BUCKET` is supposed to be set by the packer setup. So it should not be set in this shell script. With this line, the override in the packer definition is not respected.

Author: prasad0896

templates/al2023/provisioners/install-nvidia-driver.sh

@@ -10,7 +10,6 @@ fi
 
 MACHINE=$(uname -m)
 readonly MACHINE
-readonly EC2_GRID_DRIVER_S3_BUCKET="ec2-linux-nvidia-drivers"
 
 function rpm_install() {
   local RPMS