Remove shift from install-nginx-attachment.sh

[superpuffin]

Shift is unecessary here, since we are already picking the first argument (i.e. $1 instead of $0, which would be the command).

[anmolbhat]

Yes, shift causes error when running the script.
If you provide
1> NO Arguments -- Shift Error -- No usage displayed
2> {--install} -- Shows usage instead of installing it --you have to do {--install} twice to get it to work.

No args: "$# = 0" → shift ⇒ error
initial $1=--install → shift drops it → run "$@" sees empty args → falls into usage

This needs to be approved. Pls.

[anmolbhat]

No args: "$# = 0" → shift ⇒ error
initial $1=--install → shift drops it → run "$@" sees empty args → falls into usage