Partially Revert "Hard mute (misskey-dev#12376)"

This reverts commit 864827f788 partially.

型定義に関する実装はそのままに
一部型定義に合わない実装の修正

packages/backend/src/models/UserProfile.ts

@@ -217,11 +217,6 @@ export class MiUserProfile {
 	})
 	public mutedWords: (string[] | string)[];
 
-	@Column('jsonb', {
-		default: [],
-	})
-	public hardMutedWords: (string[] | string)[];
-
 	@Column('jsonb', {
 		default: [],
 		comment: 'List of instances muted by the user.',