FIX: modify the name of high flow

jira: none
Change-Id: Icd1a0ac91e957fc38a6f072b1bb3af0c97be398e
(cherry picked from commit ea0691f092755d7e68db3ecf8b46b0e86a8fadb2)

src/libslic3r/PrintConfig.hpp

@@ -373,9 +373,9 @@ enum ExtruderType {
 };
 
 enum NozzleVolumeType {
-    nvtNormal = 0,
-    nvtBigTraffic,
-    nvtMaxNozzleVolumeType = nvtBigTraffic
+    nvtStandard = 0,
+    nvtHighFlow,
+    nvtMaxNozzleVolumeType = nvtHighFlow
 };
 
 enum FilamentMapMode {