wayland/xx colormanagement: remove ext_srgb and rec.709 transfer functions

I'm not sure if we handle them correctly, and there's no test client nor autotest.
They can be added back later when we have that

src/wayland/xx_colormanagement_v4.cpp

@@ -30,10 +30,8 @@ void XXColorManagerV4::xx_color_manager_v4_bind_resource(Resource *resource)
     send_supported_primaries_named(resource->handle, primaries::primaries_srgb);
     send_supported_primaries_named(resource->handle, primaries::primaries_bt2020);
 
-    send_supported_tf_named(resource->handle, transfer_function::transfer_function_bt709);
     send_supported_tf_named(resource->handle, transfer_function::transfer_function_gamma22);
     send_supported_tf_named(resource->handle, transfer_function::transfer_function_srgb);
-    send_supported_tf_named(resource->handle, transfer_function::transfer_function_ext_srgb);
     send_supported_tf_named(resource->handle, transfer_function::transfer_function_st2084_pq);
     send_supported_tf_named(resource->handle, transfer_function::transfer_function_linear);
 
@@ -227,7 +225,6 @@ void XXColorParametricCreatorV4::xx_image_description_creator_params_v4_set_tf_n
     }
     switch (tf) {
     case XX_COLOR_MANAGER_V4_TRANSFER_FUNCTION_SRGB:
-    case XX_COLOR_MANAGER_V4_TRANSFER_FUNCTION_BT709:
     case XX_COLOR_MANAGER_V4_TRANSFER_FUNCTION_GAMMA22:
         m_transferFunctionType = TransferFunction::gamma22;
         return;