Sectors not respected when running not necessary

[DavidMStraub]

When running or matching is not necessary in match_run, the input WC instance is returned:

wilson/wilson/classes.py

Lines 88 to 89 in a4bb794

	if self.wc.basis == basis and self.wc.eft == eft and scale == self.wc.scale:
	return self.wc # nothing to do

However in this case the sectors keyword argument is ignored, i.e. also Wilson coefficients from different sectors can be returned. This might not be what the user expects. Either the output coefficients should be filtered or a warning issued.