staging: pi433: Fix disordered switch case

Case: SHAPING_0_5 is writing DATAMODUL_MODLATION_SHAPE_0_3 value and
vice versa

Signed-off-by: Kari Argillander <kari.argillander@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>