fix error response names for std and avg

Author: gouarin

pylbm_ui/responses.py

@@ -234,15 +234,15 @@ def value(self):
         return np.log10(std) if self.log10 else std
 
     def __str__(self):
-        return f'ErrStd_{self.field}'
+        return f'StdErr_{self.field}'
 
 class ErrorAvg(ErrorStd):
     def value(self):
         avg = np.average(np.asarray(self.error))
         return np.log10(avg) if self.log10 else avg
 
     def __str__(self):
-        return f'ErrAvg_{self.field}'
+        return f'AvgErr_{self.field}'
 
 class CFL(AfterSimulation):
     def __init__(self, rho, q):