Fix unfinished localisation - Removed this.updateSource from spell.ts

[DanielMoran15999]

Previous behavior: Any spell added to or imported from a compendium would have its description replaced with "a brand new spell" and its max range replaced with "10 paces"

New behavior: Spells added to or imported from compendiums retain their Max range and descriptions

Changes / Comments

Removed this.updateSource from spell.ts

Extra Info

Extra information for the fix is also quite helpful. Try to answer any relevant questions in the comment.

• [ ] Did this PR have to change template.yml? - No
• [ ] If so, were there any steps taken to protect existing user data? A migration task? N/A
• [x] Did you follow the contributing guidelines?
• [x] Is this PR limited to fixing just one issue? Yes

[StasTserk]

Closing as there is a fix included in #513