[BUG] Correctly check arguments for chroma cli for chroma update

[priyankc]

Description of changes

When a user runs chroma update from the command line, the code should detect this command and run the update() function to check for newer versions of Chroma. It is incorrectly checking for the command line arguments

Test plan

pip install -e .

python3 -c "import sys; from chromadb.cli import cli; sys.argv = ['chroma', 'update']; cli.app()"

• Doesn't trigger chroma update. You will see a wrong message:

• Run the above with fix, you will see update run correctly.

• Tests pass locally with pytest for python, yarn test for js, cargo test for rust