Remove zoom-invalid signal from EvView
It was used by EvView when sizing mode was best-fit or fit-width to request the window for its content size. This is not needed at all, since we already call size_allocate on parent class. GtkScrolledWindow takes into account the shadow type and scrollbars visibility in its size_allocate method, so we can just take the allocation returned to calculate the zoom in case of best-fit or fit-width.
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