Fixed exists callback bug

apps/remix-ide/src/app/files/fileManager.js

@@ -121,10 +121,7 @@ class FileManager extends Plugin {
     try {
       path = this.limitPluginScope(path)
       const provider = this.fileProviderOf(path)
-      const result = provider.exists(path, (err, result) => {
-        if (err) return false
-        return result
-      })
+      const result = provider.exists(path, () => {})
 
       return result
     } catch (e) {

apps/remix-ide/src/app/files/fileProvider.js

@@ -67,6 +67,7 @@ class FileProvider {
     // todo check the type (directory/file) as well #2386
     // currently it is not possible to have a file and folder with same path
     const ret = this._exists(path)
+    if (cb) cb(null, ret)
 
     return ret
   }