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Fix missing pull-down on OBS Pro and remove double button pin initial…#391

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FabianSchwartau wants to merge 1 commit intoopenbikesensor:mainfrom
FabianSchwartau:fix_missing_button_pulldown
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Fix missing pull-down on OBS Pro and remove double button pin initial…#391
FabianSchwartau wants to merge 1 commit intoopenbikesensor:mainfrom
FabianSchwartau:fix_missing_button_pulldown

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@FabianSchwartau
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We forgot to add a pull-down resistor on the current OBS Pro prototypes. This patch enables the internal pull-down, which fixed this. This should not affect the classic, as it also uses an (external) pull-down. The internal is much weaker (42k) than the external (10k).
This fixes the long delay of button presses and probably other problems related to the button and flashing (as the button uses a strapping-pin).
I also removed a double-initialization of the button pin.

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