Remove Apache 2 license from SKILL.md (#22322)

Author: rasmi

tests/llm_translation/test_skills_data/slack-gif-creator.zip

@@ -1,7 +1,6 @@
 ---
 name: slack-gif-creator
 description: Knowledge and utilities for creating animated GIFs optimized for Slack. Provides constraints, validation tools, and animation concepts. Use when users request animated GIFs for Slack like "make me a GIF of X doing Y for Slack."
-license: Complete terms in LICENSE.txt
 ---
 
 # Slack GIF Creator