fix jerky scrolling when using trackpad#16538
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When scrolling on a trackpad using a two-finger swipe only the vertical component of the event should be used for calculating the scroll delta. `dt_gui_get_scroll_unit_delta()` adds `delta_x` and `delta_y` which can lead to unexpected jerky scrolling when swiping diagonally. fixes darktable-org#16537
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When scrolling on a trackpad using a two-finger swipe only the vertical component of the event should be used for calculating the scroll delta.
dt_gui_get_scroll_unit_delta()addsdelta_xanddelta_ywhich can lead to unexpected jerky scrolling when swiping diagonally.fixes #16537