dinput: Don't reset dead zone and saturation when setting data format.

[Vitaliy Margolen]

Additional tests indicate that native doesn't touch previously set
properties.
---
 dlls/dinput/joystick_linux.c      |   32 +++-----------------------------
 dlls/dinput/joystick_linuxinput.c |   13 ++++++++++++-
 dlls/dinput/tests/joystick.c      |   23 ++++++++++++++++++++++-
 3 files changed, 37 insertions(+), 31 deletions(-)
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