Update chatgpt.sh

With the new chat completion mode it is not possible to influence the init prompt. So it should be set in the initprompt parameters.

It is wrong to execute two shifts with the switch parameters.

it should also be considered whether the context mode can be omitted due to the new chat completion mode

chatgpt.sh

@@ -147,12 +147,14 @@ while [[ "$#" -gt 0 ]]; do
 	case $1 in
 	-i | --init-prompt)
 		CHAT_INIT_PROMPT="$2"
+		SYSTEM_PROMPT="$2"
 		CONTEXT=true
 		shift
 		shift
 		;;
 	--init-prompt-from-file)
 		CHAT_INIT_PROMPT=$(cat "$2")
+		SYSTEM_PROMPT=$(cat "$2")
 		CONTEXT=true
 		shift
 		shift
@@ -190,13 +192,11 @@ while [[ "$#" -gt 0 ]]; do
 	-c | --chat-context)
 		CONTEXT=true
 		shift
-		shift
 		;;
 	-cc | --chat-completion)
 		MODEL="gpt-3.5-turbo"
 		CHAT_COMPLETION=true
 		shift
-		shift
 		;;
 	*)
 		echo "Unknown parameter: $1"