secondlife/viewer#2395 fix start location coordinates getting double escaped

indra/newview/lllogininstance.cpp

@@ -602,13 +602,14 @@ std::string construct_start_string()
         {
             // a startup URL was specified
             LLVector3 position = start_slurl.getPosition();
-            std::string unescaped_start =
+            // NOTE - do not xml escape here, will get escaped properly later by LLSD::asXMLRPCValue()
+            // see secondlife/viewer#2395
+            start =
             STRINGIZE(  "uri:"
                       << start_slurl.getRegion() << "&"
                         << position[VX] << "&"
                         << position[VY] << "&"
                         << position[VZ]);
-            start = LLStringFn::xml_encode(unescaped_start, true);
             break;
         }
         case LLSLURL::HOME_LOCATION: