Correct problem with str formatting in QuantityValues.

Author: jongablop

setup.py

@@ -2,7 +2,7 @@
 
 setup(
     name="ferpy",
-    version="0.1.15",
+    version="0.1.16",
     author="Jon Gabirondo-López",
     author_email="jon.gabirondol@ehu.eus",
     description="A Python implementation of the FER data structure.",

src/ferpy/main/quantity_values.py

@@ -138,6 +138,6 @@ def __str__(self):
         if len(self.values) == 1 and len(self.values[0]) == 1:
             value = self.values[0][0]
             uncertainty = self.standard_uncertainties[0][0] if self.standard_uncertainties else 0
-            return rf"${symbol} = ({value} \pm {uncertainty}) \, {unit}$"
+            return rf"{symbol} = ({value} \pm {uncertainty}) \, {unit}"
 
         return f"QuantityValues: {self.name or 'Unnamed'}"