Fix failing tests in t_qcqps_master when 'DEFAULT' implies 'FMINCON' (as in MATLAB Online).

- In this case, qcqps_master() can be used to solve LP / QP problems, unlike when explicitly selecting 'FMINCON', which explicitly skipped these tests.
- No idea why these tests were failing on MATLAB Online, but passing on MATLAB GitHub runners. Must be something different in the environment that results in small numerical differences.

Author: rdzman

lib/t/t_qcqps_master.m

@@ -69,6 +69,10 @@ function t_qcqps_master(quiet)
             opt.knitro_opt = artelys_knitro_options([],  mpopt);
             opt.knitro_opt.ncvx_qcqp_init = 1;
         end
+        if have_feature('fmincon')
+            %% needed for QP problems when 'DEFAULT' means 'FMINCON'
+            opt.fmincon_opt.opts.OptimalityTolerance = 1e-8;
+        end
 
         if does_lp(k)
             t = sprintf('%s - 3-d LP : ', names{k});