Proper plotting of close L values in L-series measurement

Fixes #408

NanoVNASaver/Charts/Inductance.py

@@ -33,7 +33,7 @@ logger = logging.getLogger(__name__)
 class InductanceChart(FrequencyChart):
     def __init__(self, name=""):
         super().__init__(name)
-        self.leftMargin = 30
+        self.leftMargin = 45
         self.dim.width = 250
         self.dim.height = 250
         self.minDisplayValue = 0
@@ -120,7 +120,7 @@ class InductanceChart(FrequencyChart):
         self.span = span
 
         target_ticks = math.floor(self.dim.height / 60)
-        fmt = Format(max_nr_digits=1)
+        fmt = Format(max_nr_digits=3)
         for i in range(target_ticks):
             val = minValue + (i / target_ticks) * span
             y = self.topMargin + round((self.maxValue - val) / self.span * self.dim.height)