DrawManager: Fix Camera Images Interfere During Selection

When drawing the selection buffer the camera images were drawn. This
resulted in unneeded extra clicking for the user. This change will
ignore camera images during the selection.

Reviewed By: fclem

Differential Revision: https://developer.blender.org/D5276

source/blender/draw/modes/object_mode.c

@@ -1115,6 +1115,10 @@ static void DRW_shgroup_camera_background_images(OBJECT_Shaders *sh_data,
                                                  Object *ob,
                                                  RegionView3D *rv3d)
 {
+  if (DRW_state_is_select()) {
+    return;
+  }
+
   if (!BKE_object_empty_image_frame_is_visible_in_view3d(ob, rv3d)) {
     return;
   }