[cleanup] remove braces

exercises/solution/exercise-biomineralization/fluidsystems/biomin.hh

@@ -332,20 +332,14 @@ public:
 
         // assume brine with viscosity effect of Ca for the liquid phase.
         if (phaseIdx == liquidPhaseIdx)
-        {
             return Brine::liquidViscosity(temperature, pressure);
-        }
 
         // assume pure CO2 for the gas phase.
         else if (phaseIdx == gasPhaseIdx)
-        {
             return CO2::gasViscosity(temperature, pressure);
-        }
 
         else
-        {
             DUNE_THROW(Dune::InvalidStateException, "Invalid phase index " << phaseIdx);
-        }
 
     }