Forgot to extend queryInterface

...in 8b533d84f3ae211fdfafc2adc8d8567f366771d4 "Missing XTypeProvider base
class."

Change-Id: I477e47f2a383caab225f55ea1c46094946971b86
chart::Wall is not a UNO service implementation

Change-Id: I6a5482f4d49e47d1a6289a29d1b573e25fa0b5c5