win32: ensure initial dpi-scale value

vo_calc_window_geometry2(...) is called to initialize the window
size with the dpi_scale value as one of the arguments.

dpi_scale is 0 initially, and set to a valid value at update_dpi(),
which is called from [force_]update_display_info().

However, no measures were taken to ensure that dpi_scale is set
correctly before vo_calc_window_geometry2() is called, which could
result in incorrect window size if it's not initialized.

It did happen to get initialized on time, by luck, because
VOCTRL_GET_DISPLAY_FPS is used early, which happens to call
update_display_info to read the fps value (other update_display_info()
calls are after the first vo_calc_window_geometry2() call).

This commit ensures that dpi_scale is initialized on time if needed.
Also, update_dpi() now ensures that dpi_scale is never 0.

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