Fixed the remaining contamination issue where PBS forms would retain PVE data
after canceling a PVE node addition. The form now properly resets when opening
the modal for adding a new node.
Two fixes were needed:
1. Set currentNodeType when editing any node (previous commit)
2. Clear form data when opening modal for new nodes (this commit)
Both issues reported by krom are now resolved:
- PBS forms no longer show PVE data
- Editing PBS nodes properly populates the form