mathmlimport: do not remove first and last braces

they are not always matching: {a + c} over {b + d}

Change-Id: Ie14d65966dc7014b6582f72a998546e0a256e94c

starmath/source/mathmlimport.cxx

@@ -574,12 +574,6 @@ void SmXMLImport::endDocument(void)
                 aText = pDocShell->GetText();
                 pTree->CreateTextFromNode(aText);
                 aText = comphelper::string::stripEnd(aText, ' ');
-                if ((aText.GetChar(0) == '{') &&
-                    (aText.GetChar(aText.Len()-1) == '}'))
-                {
-                    aText.Erase(0,1);
-                    aText.Erase(aText.Len()-1,1);
-                }
             }
             pDocShell->SetText( String() );