[449-legend] VsGenx: made legend visible (Closes #449)

Merging branch '449-legend'  into 'main'.

See merge request !1347

Examples/specular/VsGenx.py

@@ -64,5 +64,4 @@ if __name__ == '__main__':
     bp.plot_simulation_result(result)
     plt.legend(['GenX', 'BornAgain'], loc='upper right')
 
-    if bp.do_show:
-        plt.show()
+    bp.show_or_export()
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