Modify mjCMesh vert_ field to be vector<float> instead of vector<double>.

PiperOrigin-RevId: 882162404
Change-Id: Ia97439420f284d594f5cb1a91cd0fb640ac8dff0

src/user/user_flexcomp.cc

@@ -1185,7 +1185,7 @@ bool mjCFlexcomp::MakeMesh(mjCModel* model, mjsCompiler* compiler, char* error,
   }
 
   // copy vertices
-  point = mesh.Vert();
+  point.assign(mesh.Vert().begin(), mesh.Vert().end());
 
   if (mesh.HasTexcoord()) {
     texcoord = mesh.Texcoord();