When selecting Material Design Dark theme, it does not apply

Issue found

• Selecting Material Dark theme on the Create new project view does not bring in Material Dark theme
• OS: MacOS
• Snapshot 116

How to reproduce

1. Open Design Studio
2. Select Create project... from the Welcome screen
3. On Project creation view
   1. Select General/empty template
   2. From style, select Material Dark
   3. Press Create
4. Style in the footer is Basic, and the Screen01 does not have import Material theme in the code. There is no sign of Material style.

How it is expected to work

• If the user selects a style on the project creation phase, the newly created project should have the style applied to it.
• Style in the footer should have Material Dark in it, and also the project should have this in the header: 

import QtQuick.Controls.Material