change background of symbol

scd31.kicad_sym

@@ -15,7 +15,7 @@
     (symbol "RF4463F30_0_1"
       (rectangle (start -7.62 15.24) (end 10.16 -10.16)
         (stroke (width 0) (type default) (color 0 0 0 0))
-        (fill (type none))
+        (fill (type background))
       )
     )
     (symbol "RF4463F30_1_1"