fix linter issues

src/app.js

@@ -237,11 +237,12 @@ Please make a backup of your contracts and start using http://remix.ethereum.org
 
   // Run the compiler instead of trying to save the website
   $(window).keydown(function (e) {
-    if ((e.metaKey || e.ctrlKey) && e.keyCode == 83) { /*ctrl+s or command+s*/
+    // ctrl+s or command+s
-      e.preventDefault();
+    if ((e.metaKey || e.ctrlKey) && e.keyCode === 83) {
-      runCompiler();
+      e.preventDefault()
+      runCompiler()
     }
-  });
+  })
 
   function importExternal (url, cb) {
     self._components.compilerImport.import(url,