Remove redundant dialyzer suppressions

Summary: Dialyzer no longer warns here, so we can remove the suppression

Reviewed By: SarahDesouky

Differential Revision: D93111371

fbshipit-source-id: f170a56881e7a4fe2e67cfbcf3d31cea64541340

Author: TD5

src/wa_raft_snapshot_catchup.erl

@@ -13,9 +13,6 @@
 -include_lib("wa_raft/include/wa_raft.hrl").
 -include_lib("wa_raft/include/wa_raft_logger.hrl").
 
-% elp:ignore W0048 (no_dialyzer_attribute): improper list expected by gen interface
--dialyzer({no_improper_lists, [handle_cast/2]}).
-
 %% Supervisor callbacks
 -export([
     child_spec/0,