Trend_diagnostics_MCMC_common.inc: do not store smoother results on disk

(cherry picked from commit c596b889)

tests/observation_trends_and_prefiltering/Trend_diagnostics_MCMC_common.inc

@@ -59,4 +59,7 @@ end
 
 if abs(mean(oo_.SmoothedShocks.Mean.e_y))>1e-2 || abs(mean(oo_.SmoothedShocks.Mean.e_p))>1e-2 || abs(mean(oo_.SmoothedShocks.Median.e_y))>1e-2 || abs(mean(oo_.SmoothedShocks.Median.e_p))>1e-2
     error('Residuals are not mean 0')
-end
\ No newline at end of file
+end
+
+fields_to_delete={'Constant','Smoother','SmoothedShocks','FilteredVariablesKStepAhead','FilteredVariablesKStepAheadVariances','FilteredVariables','SmoothedVariables','UpdatedVariables','PointForecast','MeanForecast','Filtered_Variables_1_step_ahead','Filtered_Variables_2_step_ahead','Filtered_Variables_4_step_ahead'};
+oo_=rmfield(oo_,fields_to_delete);