Change simple summation to a root sum of squares for vx_error and vy_error in composites

[mliukis]

Consider a change for v3:
a code is written as a simple summation of errors. It might be better to add it as a root sum of squares: sqrt(v[xy]_error2 + error2).

its_live_production/src/itslive_composite.py

Lines 2187 to 2192 in 6ce62c5

	# Note: a code is written as a simple summation of errors. It might be better to add it
	# as a root sum of squares: sqrt(v[xy]_error**2 + error**2). Something to consider for v3.
	for value, error in ITSLiveComposite.CO_REGISTRATION_ERROR.items():
	mask = (stable_shift_values == value)
	self.vx_error[mask] += error
	self.vy_error[mask] += error