DiffractionExperiment: slsDetectorPackage use string for server version

detector_control/DetectorWrapper.cpp

@@ -205,10 +205,10 @@ int64_t DetectorWrapper::GetFirmwareVersion() {
     }
 }
 
-int64_t DetectorWrapper::GetDetectorServerVersion() {
+std::string DetectorWrapper::GetDetectorServerVersion() {
     try {
         auto result = det.getDetectorServerVersion();
-        return result.squash(0x0);
+        return result.squash("");
     } catch (std::exception &e) {
         throw JFJochException(JFJochExceptionCategory::Detector, e.what());
     }