removed unneeded brackets

NanoVNASaver/SITools.py

@@ -84,7 +84,7 @@ class Value:
     def __str__(self) -> str:
         fmt = self.fmt
         if math.isnan(self._value):
-            return (f"-{fmt.space_str}{self._unit}")
+            return f"-{fmt.space_str}{self._unit}"
         if (fmt.assume_infinity and
                 abs(self._value) >= 10 ** ((fmt.max_offset + 1) * 3)):
             return (("-" if self._value < 0 else "") +