docs(README): Fix up package managers example

Fix up `ort-scan` variable used to set which package managers
to enable in a ORT run.
This used to be ORT Analyzer specific command but has since
been changed to ORT CLI parameter.

Add '-P ort.forceOverwrite=true --stacktrace' to retain the
default value as set in [1].

[1]: https://github.com/oss-review-toolkit/ort-ci-gitlab/blob/8ba72c23/templates/ort-scan.yml#L82

Signed-off-by: Thomas Steenbergen <[email protected]>

Author: tsteenbe

README.md

@@ -89,7 +89,7 @@ ort-scan:
     VCS_URL: 'ssh://[email protected]:jshttp/mime-types.git'
     VCS_REVISION: 'ef932231c20e716ec27ea159c082322c3c485b66'
     ALLOW_DYNAMIC_VERSIONS: 'true'
-    ORT_CLI_ANALYZE_ARGS: '-P ort.analyzer.enabledPackageManagers=NPM,Yarn,Yarn2'
+    ORT_CLI_ARGS: '-P ort.analyzer.enabledPackageManagers=NPM,Yarn,Yarn2 -P ort.forceOverwrite=true --stacktrace'
   before_script:
     # Use HTTPS instead of SSH for Git cloning
     - git config --global url.https://github.com/.insteadOf ssh://[email protected]/