Rename deferred style sheet

public/scripts/main.js

@@ -7,7 +7,7 @@ class PairDrop {
         this.$headerInstallBtn = $('install');
 
         this.deferredStyles = [
-            "styles/deferred-styles.css"
+            "styles/styles-deferred.css"
         ];
         this.deferredScripts = [
             "scripts/browser-tabs-connector.js",

public/service-worker.js

@@ -6,7 +6,7 @@ const relativePathsToCache = [
     'index.html',
     'manifest.json',
     'styles/styles-main.css',
-    'styles/deferred-styles.css',
+    'styles/styles-deferred.css',
     'scripts/localization.js',
     'scripts/main.js',
     'scripts/network.js',