fix: set luis recognizer type for dialog in formEditor

[alanlong9278]

Description

set luis recognizer type for dialog recognizer property in formEditor.

There is the code to set luis recognizer type in current master branch.

 if (selectedFile) {
  onChange(currentDialog.luFile);
}

But currentDialog.luFile is '', it will cause the recognizer is '', and can not create recognizered intent, So I revert the code to

if (selectedFile) {
  onChange(`${currentDialogId}.lu`);
}

Task Item

Screenshots

[github-actions]

Coverage remained the same at 39.591% when pulling e6967b0 on julong/recognizerBugfix into 8d594d5 on master.