classdef: call subsref method with correct nargout value (bug #48693) * /libinterp/octave-value/ov-classdef.cc (octave_classdef::subsref): Correct the nargout value for classdef subsref calls by checking the number of values the indexing argument addresses, using the same code used by the non-classdef subsref method. * /test/bug-48693/bug-48693.tst, bug48693.m, module.mk: Add simple test function files to verify subsref behavior.

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[*.{am,mk}]
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