build-appliance-image: Update to dunfell head revision

(From OE-Core rev: a8debddd6cbdd70db74e096d72f97fbee008ee63)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/images/build-appliance-image_15.0.0.bb

@@ -24,7 +24,7 @@ IMAGE_FSTYPES = "wic.vmdk"
 
 inherit core-image module-base setuptools3
 
-SRCREV ?= "235dff82276a8a2ff4d0ee1cf93243925537551c"
+SRCREV ?= "fadf7d3343305337c38a5243797723c68e88276a"
 SRC_URI = "git://git.yoctoproject.org/poky;branch=dunfell \
            file://Yocto_Build_Appliance.vmx \
            file://Yocto_Build_Appliance.vmxf \