Switch to using CFBundleVersion instead of CFBundleShortVersionString for the default

There is a discrepancy between definitions and patch data generated by `patchstarter.py` and Jamf's official patch feed. The official definitions do seem to be using `CFBundleVersion` and not `CFBundleShortVersionString`.

To better align with the official feed, I plan to change the behavior in `patchstarter.py` to use `CFBundleVersion`. I will include a new argument `--short-version` to force the script to reference `CFBundleShortVersionString` to preserve the original behavior for those who wish to continue using it.

Looking for comments before implementing this change.

Start in patchstarter.py and trace how the default bundle version key is selected and how command-line arguments are parsed. Implement the requested default and --short-version override, then verify that both version-selection paths preserve their intended behavior.

Written by the indexing model from the issue text.