remove redundant content type check

Author: dumbasPL

lib/mail-parser.js

@@ -1045,11 +1045,9 @@ class MailParser extends Transform {
         html.replace(/\bcid:([^'"\s]{1,256})/g, (match, cid) => {
             for (let i = 0, len = this.attachmentList.length; i < len; i++) {
                 if (this.attachmentList[i].cid === cid && /^image\/[\w]+$/i.test(this.attachmentList[i].contentType)) {
-                    if (/^image\/[\w]+$/i.test(this.attachmentList[i].contentType)) {
-                        cids.set(cid, {
-                            attachment: this.attachmentList[i]
-                        });
-                    }
+                    cids.set(cid, {
+                        attachment: this.attachmentList[i]
+                    });
                     break;
                 }
             }