refactor(community): sonar 반영

- Boolean -> boolean

Author: ayoung-dev

src/main/java/com/somemore/community/domain/CommunityComment.java

@@ -56,7 +56,7 @@ public void replaceComment() {
         this.content = "삭제된 댓글입니다";
     }
 
-    public Boolean isDeleted() {
+    public boolean isDeleted() {
         return this.getDeleted();
     }
 }