use local debug instance instead of api

src/app.js

@@ -503,7 +503,7 @@ Please make a backup of your contracts and start using http://remix.ethereum.org
   var txLogger = new TxLogger() // eslint-disable-line
   txLogger.event.register('debuggingRequested', (hash) => {
     if (!appStore.isActive('debugger')) appManager.activateOne('debugger')
-    appStore.getOne('debugger').api.debugger().debug(hash)
+    debug.debugger().debug(hash)
     verticalIconsApi.select('debugger')
   })