Add CRLF to encoded multipart form data

Some WPT tests were failing because they expected the body for a
multipart form data response to end with a CRLF. So I updated
encode_multipart_form_data to add the missing terminator.

components/script/dom/htmlformelement.rs

@@ -1366,7 +1366,7 @@ pub fn encode_multipart_form_data(
         }
     }
 
-    let mut boundary_bytes = format!("\r\n--{}--", boundary).into_bytes();
+    let mut boundary_bytes = format!("\r\n--{}--\r\n", boundary).into_bytes();
     result.append(&mut boundary_bytes);
 
     result

tests/wpt/metadata/fetch/api/response/response-consume.html.ini

@@ -34,15 +34,6 @@
   [Consume response's body: from FormData to formData]
     expected: FAIL
 
-  [Consume response's body: from FormData to blob]
-    expected: FAIL
-
-  [Consume response's body: from FormData to text]
-    expected: FAIL
-
-  [Consume response's body: from FormData to arrayBuffer]
-    expected: FAIL
-
   [Consume response's body: from stream to blob]
     expected: FAIL
 

tests/wpt/mozilla/meta/MANIFEST.json

@@ -18442,7 +18442,7 @@
    "testharness"
   ],
   "mozilla/FileAPI/resource/file-submission.py": [
-   "24d5129eb8d38c9415622c78ed401ae344273ce1",
+   "79e72fb99a95c186e4916b40627ee762d694b8ea",
    "support"
   ],
   "mozilla/FileAPI/resource/upload.txt": [

tests/wpt/mozilla/tests/mozilla/FileAPI/resource/file-submission.py

@@ -21,7 +21,7 @@ def main(request, response):
     boundary = content_type[1].strip("boundary=")
 
     body = "--" + boundary + "\r\nContent-Disposition: form-data; name=\"file-input\"; filename=\"upload.txt\""
-    body += "\r\n" + "content-type: text/plain\r\n\r\nHello\r\n--" + boundary + "--"
+    body += "\r\n" + "content-type: text/plain\r\n\r\nHello\r\n--" + boundary + "--\r\n"
 
     if body != request.body:
         return fail("request body doesn't match: " + body + "+++++++" + request.body)