Correct Response's statusText check

This has been wrong for a decade (see 3864756) and nobody noticed until now.

Fixes #1794.

Author: annevk

fetch.bs

@@ -8273,8 +8273,8 @@ enum ResponseType { "basic", "cors", "default", "error", "opaque", "opaqueredire
  <li><p>If <var>init</var>["{{ResponseInit/status}}"] is not in the range 200 to 599, inclusive,
  then <a>throw</a> a {{RangeError}}.
 
- <li><p>If <var>init</var>["{{ResponseInit/statusText}}"] does not match the
- <a spec=http1>reason-phrase</a> token production, then <a>throw</a> a {{TypeError}}.
+ <li><p>If <var>init</var>["{{ResponseInit/statusText}}"] is not the empty string and does not match
+ the <a>reason-phrase</a> token production, then <a>throw</a> a {{TypeError}}.
 
  <li><p>Set <var>response</var>'s <a for=Response>response</a>'s <a for=response>status</a> to
  <var>init</var>["{{ResponseInit/status}}"].
@@ -9072,14 +9072,14 @@ Alexey Proskuryakov,
 Andreas Kling,
 Andrés Gutiérrez,
 Andrew Sutherland,
-Andrew Williams,<!-- recvfrom; GitHub -->
+Andrew Williams<!-- recvfrom; GitHub -->,
 Ángel González,
 Anssi Kostiainen,
 Arkadiusz Michalski,
 Arne Johannessen,
 Artem Skoretskiy,
 Arthur Barstow,
-Arthur Sonzogni, <!-- ArthurSonzogni; GitHub -->
+Arthur Sonzogni<!-- ArthurSonzogni; GitHub -->,
 Asanka Herath,
 Axel Rauschmayer,
 Ben Kelly,
@@ -9118,6 +9118,7 @@ Ehsan Akhgari,
 Emily Stark,
 Eric Lawrence,
 Eric Orth,
+Feng Yu<!-- F3n67u; GitHub -->,
 François Marier,
 Frank Ellerman,
 Frederick Hirsch,