Add missing style

Author: Alexander Pann

code/languages/org.iets3.opensource/languages/org.iets3.core.expr.math/models/editor.mps

@@ -907,6 +907,7 @@
     <ref role="1XX52x" to="1qv1:5mz5Tt_h1dJ" resolve="RationalType" />
     <node concept="3F0ifn" id="5mz5Tt_h1eb" role="2wV5jI">
       <property role="3F0ifm" value="rat" />
+      <ref role="1k5W1q" to="itrz:7D7uZV2g_XJ" resolve="iets3Type" />
     </node>
   </node>
   <node concept="24kQdi" id="5mz5Tt_jL6x">