[freeflow][staggeredupwindfluxvars] Remove superfluous semicolon

dumux/freeflow/navierstokes/staggered/staggeredupwindfluxvariables.hh

@@ -602,7 +602,7 @@ private:
     static SubControlVolumeFace makeParallelGhostFace_(const SubControlVolumeFace& ownScvf, const int localSubFaceIdx)
     {
         return ownScvf.makeBoundaryFace(ownScvf.pairData(localSubFaceIdx).lateralStaggeredFaceCenter);
-    };
+    }
 };
 
 } // end namespace Dumux