Fix for when prompt contains an odd num of apostrophes (#4660)

The apostrophes in args.user_args are mixed with the single quotes used
to enclose x in the parsing code.

For example,
`deepspeed --num_nodes 1 --num_gpus 8 --no_local_rank run_generation.py
--model_name_or_path tiiuae/falcon-40b --max_new_tokens 128 --prompt
"I'm a student"`

instead of (which doesn't work):
`deepspeed --num_nodes 1 --num_gpus 8 --no_local_rank run_generation.py
--model_name_or_path tiiuae/falcon-40b --max_new_tokens 128 --prompt
'I'm a student'`

To resolve this issue, we can make a change to enclose x in double
quotes instead of single quotes.

Co-authored-by: Logan Adams <114770087+loadams@users.noreply.github.com>

deepspeed/launcher/runner.py

@@ -390,7 +390,7 @@ def main(args=None):
     args = parse_args(args)
 
     # For when argparse interprets remaining args as a single string
-    args.user_args = shlex.split(" ".join(list(map(lambda x: x if x.startswith("-") else f"'{x}'", args.user_args))))
+    args.user_args = shlex.split(" ".join(list(map(lambda x: x if x.startswith("-") else f'"{x}"', args.user_args))))
 
     if args.elastic_training:
         assert args.master_addr != "", "Master Addr is required when elastic training is enabled"