There is no way to remove just that single permission. It is in the permission Can Manage Threads:
Quote:
Can Manage Threads
This permission covers the rest of the thread permissions (stick, merge, split, etc).
Sticking a thread makes it so it always appears at the top of the thread listing. Merging allows a moderator to combine the posts of two threads into one thread. Splitting allows a moderator to split the posts from one thread into two threads.
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