MAINTAINERS: Remove sjanc from Bluetooth Classic group

sjanc is not working on BT Classic and shouldn't be assigned as
reviewer for those.

Signed-off-by: Szymon Janc <szymon.janc@codecoup.pl>

MAINTAINERS.yml

@@ -496,7 +496,6 @@ Bluetooth Classic:
     - lylezhu2012
   collaborators:
     - jhedberg
-    - sjanc
   files:
     - subsys/bluetooth/common/
     - subsys/bluetooth/host/classic/