Update isort settings file path in fix_all.sh (#1855)

Update `isort` settings file path in `fix_all.sh` to `${PROJ_TOML}` so that this script finds the config path correctly. 

This is a follow-up PR of #1854.

## By Submitting this PR I confirm:
- I am familiar with the [Contributing Guidelines](https://github.com/nv-morpheus/Morpheus/blob/main/docs/source/developer_guide/contributing.md).
- When the PR is ready for review, new or existing tests cover these changes.
- When the PR is ready for review, the documentation is up to date with these changes.

Authors:
  - Yuchen Zhang (https://github.com/yczhang-nv)

Approvers:
  - David Gardner (https://github.com/dagardner-nv)
  - Anuradha Karuppiah (https://github.com/AnuradhaKaruppiah)

URL: #1855

ci/scripts/fix_all.sh

@@ -99,7 +99,7 @@ fi
 # Run isort
 if [[ "${SKIP_ISORT}" == "" ]]; then
    echo "Running isort..."
-   python3 -m isort --settings-file ${PY_CFG} ${PY_MODIFIED_FILES[@]} 2>&1
+   python3 -m isort --settings-file ${PROJ_TOML} ${PY_MODIFIED_FILES[@]} 2>&1
 fi
 
 # Run yapf