Unable to run a Flutter app because <no devices> even Device File Explorer can detect it

## Description

I plugged my device to my development laptop to run a Flutter app. My laptop is already allowed to connect to my mobile device.

However, the button Run does not allow me to deploy the app to the connected device because it thinks that there is no connected device. It is quite wrong. The tab Device File Explorer can browse files in the device already.

The `flutter` CLI tool can detect the connected device too

```
C:\Users\pcdinh>flutter upgrade
Upgrading Flutter from D:\dev\flutter...
From https://github.com/flutter/flutter
0260642fc..1c3f6a851 master -> origin/master
Updating 0260642fc..1c3f6a851
2 files changed, 31 insertions(+), 1 deletion(-)

Upgrading engine...
Updating flutter tool...
Already up-to-date.

Flutter 0.2.12-pre.29 • channel master • https://github.com/flutter/flutter.git
Framework • revision 0260642fc5 (6 hours ago) • 2018-04-12 21:16:39 -0700
Engine • revision 76cb311d9c
Tools • Dart 2.0.0-dev.47.0.flutter-f76dad0adc

Running flutter doctor...
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel master, v0.2.12-pre.30, on Microsoft Windows [Version 10.0.16299.309], locale en-US)
[!] Android toolchain - develop for Android devices (Android SDK 27.0.3)
X Android license status unknown.
[√] Android Studio (version 3.1)
[√] IntelliJ IDEA Community Edition (version 2017.3)
[√] VS Code, 64-bit edition (version 1.22.1)
[√] Connected devices (1 available)

! Doctor found issues in 1 category.
```

## Steps to Reproduce

- Launch Android Studio with the latest Flutter plugin
- Edit code
- Plugin the device and ensure that the device is connected.
- Press "Run" icon. The dialog appears: "No connected devices found; please connect a device, or see flutter.io/setup for getting started instructions."'. However, the tab Device File Explorer can see files in the device.

Screenshot: https://imgur.com/a/qEJrR

## Version info

```
D:\dev\flutter\bin\flutter.bat --no-color doctor
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel master, v0.2.12-pre.30, on Microsoft Windows [Version 10.0.16299.309], locale en-US)
[!] Android toolchain - develop for Android devices (Android SDK 27.0.3)
X Android license status unknown.
[√] Android Studio (version 3.1)
[√] IntelliJ IDEA Community Edition (version 2017.3)
[√] VS Code, 64-bit edition (version 1.22.1)
[√] Connected devices (1 available)
```

```
Android Studio 3.1.1
```

```
Flutter plugin 23.2.2
```