Imported Enhance power Control: Piloting upgrades mods generate errors.

[obrenckle]

Describe the bug
After being imported from Oggdude's data, the modifiers from both Control: Piloting upgrades of the Enhance force power generates error when trying to alter them.
Deleting and recreating them fix the issue.

To Reproduce
Steps to reproduce the behavior:

1. Import force powers from Oggdude
2. Open "Enhance" force power from the compendium
3. Click on the gear icon of one of the Control: Piloting ... upgrades to access modifiers
4. Change "Skill boost" to "Skill force boost"
5. See error: Attribute keys may not contain spaces or periods and in console TypeError: Cannot create property '-=Piloting: Space' on number '2' at PopoutModifiers._updateObject (popout-modifiers.js:96:67)
6. Any modification except deleting the modifier isn't saved.

Expected behavior
The modifiers is changed and saved without error.

Screenshots

Desktop (please complete the following information):

• Foundry Version: 12.330
• System Version mostly 1.902 with additional commits
• Hosted on Forge: No

[obrenckle]

The key set during import for the attribute containing the modifiers data use the skill name, i.e. system.upgrades.upgrade4.attributes["Piloting: Planetary"], while key created manual have a generic fomr attr+datetime, e.g. system.upgrades.upgrade8.attributes.attr1723360981032.