Fix SOLPSLineEmitter to pass atomic_data argument when initialising the line shape

[vsnever]

In Cherab 1.5, LineShapeModel takes an atomic_data argument when initialised. SOLPSLineEmitter needs to be updated to support this change:

solps/cherab/solps/models/line_emitter.pyx

Lines 105 to 107 in ef318b1

	# instance line shape renderer
	self._lineshape = self._lineshape_class(self._line, self._wavelength, self._target_species, self._plasma,
	*self._lineshape_args, **self._lineshape_kwargs)

[vsnever]

Fixed in #76.