Android: Launch "adb track-devices" with explicit working directory

Since no working directory was explicitly set, the "bin/" directory of
QtC was chosen as working directory.

"adb track-devices" leaves the server process alive after terminating,
and that server process used QtC's working directory. On Windows, that
caused that directory to be undeletable/unmovable as long as the adb
server was alive.

This change sets the working directory of "adb track-devices" to the
parent dir of the adb binary.

Task-number: QTCREATORBUG-28932
Change-Id: I3adf52829c9f4bf456d05d2685c04314e1d25a40
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>

src/plugins/android/androiddevice.cpp

@@ -645,6 +645,7 @@ void AndroidDeviceManager::setupDevicesWatcher()
 
     const CommandLine command = CommandLine(m_androidConfig.adbToolPath(), {"track-devices"});
     m_adbDeviceWatcherProcess->setCommand(command);
+    m_adbDeviceWatcherProcess->setWorkingDirectory(command.executable().parentDir());
     m_adbDeviceWatcherProcess->setEnvironment(AndroidConfigurations::toolsEnvironment(m_androidConfig));
     m_adbDeviceWatcherProcess->start();