fix iint/iiint import from docx math

Use the correct LO names for the symbols.

Change-Id: I4da760fb84e6f9ca811e13061341f9a993342c29
Reviewed-on: https://gerrit.libreoffice.org/3059Reviewed-by: Fridrich Strba <fridrich@documentfoundation.org>
Tested-by: Fridrich Strba <fridrich@documentfoundation.org>

starmath/source/ooxmlimport.cxx

@@ -530,10 +530,10 @@ OUString SmOoxmlImport::handleNary()
             ret = "int";
             break;
         case MS_IINT:
-            ret = "liint";
+            ret = "iint";
             break;
         case MS_IIINT:
-            ret = "liiint";
+            ret = "iiint";
             break;
         case MS_LINT:
             ret = "lint";