Set default channel count for AnalyserNode to 2

This was deliberately changed
(WebAudio/web-audio-api#1397 ) but the tests
have not been updated

components/script/dom/analysernode.rs

@@ -38,7 +38,7 @@ impl AnalyserNode {
         options: &AnalyserOptions,
     ) -> Fallible<(AnalyserNode, IpcReceiver<Block>)> {
         let node_options = options.parent
-                                  .unwrap_or(1, ChannelCountMode::Max,
+                                  .unwrap_or(2, ChannelCountMode::Max,
                                              ChannelInterpretation::Speakers);
 
         if options.fftSize > 32768 || options.fftSize < 32 ||

tests/wpt/metadata/MANIFEST.json

    "support"
   ],
   "webaudio/the-audio-api/the-analysernode-interface/ctor-analyser.html": [
-   "4e27f842ddeda3e2bdd78da7b8ee3f67062d1a9f",
+   "a9aa4831516c6a5cefa7c8b4f67f3ef246d24777",
    "testharness"
   ],
   "webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-basic.html": [
    "testharness"
   ],
   "webaudio/the-audio-api/the-analysernode-interface/test-analysernode.html": [
-   "52d3829cff3dfceef64a34669bc8e0d6e08883a9",
+   "a8b5a7154e94479460c1085c6b5cb584e9b6976c",
    "testharness"
   ],
   "webaudio/the-audio-api/the-audiobuffer-interface/.gitkeep": [

tests/wpt/web-platform-tests/webaudio/the-audio-api/the-analysernode-interface/ctor-analyser.html

@@ -32,7 +32,7 @@
           prefix: prefix,
           numberOfInputs: 1,
           numberOfOutputs: 1,
-          channelCount: 1,
+          channelCount: 2,
           channelCountMode: 'max',
           channelInterpretation: 'speakers'
         });

tests/wpt/web-platform-tests/webaudio/the-audio-api/the-analysernode-interface/test-analysernode.html

@@ -27,8 +27,8 @@
 
       assert_equals(
         analyser.channelCount,
-        1,
-        "analyser node has 1 input channels by default"
+        2,
+        "analyser node has 2 input channels by default"
       );
       assert_equals(
         analyser.channelCountMode,
@@ -131,8 +131,8 @@
       var analyser = new AnalyserNode(context);
       assert_equals(
         analyser.channelCount,
-        1,
-        "analyser node has 1 input channels by default"
+        2,
+        "analyser node has 2 input channels by default"
       );
       assert_equals(
         analyser.channelCountMode,