[bug] Arguments separated by commas are treated as one

[amalej]

Versions

onfire-cli:
firebase-tools:
node:

Bug description

Arguments separated by commas are treated as one

Steps to reproduce the behavior

1. Run onfire
2. Run emulators:start --only firestore,functions
3. Exit the emulator
4. Type emulators:start --only

> emulators:start --only
Description: Only specific emulators. This is a comma separated list of emulator names. Valid options are: ["auth","functions","firestore","database","hosting","pubsub","storage","eventarc"]
firestore,functions
-
-
-

Expected behavior

For emulators:start --only to show firestore and functions as separated inputs

i.e.

> emulators:start --only
Description: Only specific emulators. This is a comma separated list of emulator names. Valid options are: ["auth","functions","firestore","database","hosting","pubsub","storage","eventarc"]
firestore
functions
-
-

Additional context