sentry - namespace files under metamask dir

app/scripts/lib/setupRaven.js

@@ -47,6 +47,6 @@ function rewriteReportUrls(report) {
 function toMetamaskUrl(origUrl) {
   const filePath = origUrl.split(location.origin)[1]
   if (!filePath) return origUrl
-  const metamaskUrl = `${filePath}`
+  const metamaskUrl = `metamask${filePath}`
   return metamaskUrl
 }