Fix sendAnnotation option (#3726)

The boolean "graphite.sendAnnotation" was added in
https://github.com/sitespeedio/sitespeed.io/pull/3625, but it can't be
disabled, because `opts.sendAnnotation || true` is always going to
evaluate to `true`. Since it defaults to `true`, the `|| true` shouldn't
be necessary, so I removed it.

lib/plugins/graphite/index.js

@@ -62,7 +62,7 @@ module.exports = {
     this.messageTypesToFireAnnotations = [];
     this.receivedTypesThatFireAnnotations = {};
     this.make = context.messageMaker('graphite').make;
-    this.sendAnnotation = opts.sendAnnotation || true;
+    this.sendAnnotation = opts.sendAnnotation;
     this.alias = {};
     this.wptExtras = {};
     this.usingBrowsertime = false;