No causer in threads

tests/datasets/api.fixture.php

@@ -338,7 +338,6 @@ return [
 			'contact-id' => 42,
 			'author-id'  => 42,
 			'owner-id'   => 42,
-			'causer-id'  => 42,
 			'uid'        => 42,
 			'wall'       => 1,
 		],
@@ -349,7 +348,6 @@ return [
 			'contact-id' => 43,
 			'author-id'  => 43,
 			'owner-id'   => 43,
-			'causer-id'  => 43,
 			'uid'        => 0,
 			'wall'       => 1,
 		],
@@ -360,7 +358,6 @@ return [
 			'contact-id' => 44,
 			'author-id'  => 44,
 			'owner-id'   => 44,
-			'causer-id'  => 44,
 			'uid'        => 0,
 			'wall'       => 1,
 		],