STYLE: prefer REGISTER/NO_REGISTER instead of true/false for IOobject

- self-documenting

applications/utilities/thermophysical/equilibriumCO/equilibriumCO.C

@@ -81,12 +81,11 @@ int main(int argc, char *argv[])
             runTime,
             IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE,
-            false
+            IOobject::NO_REGISTER
         )
     );
 
 
-
     const scalar P = 1e5;
     const scalar T = 3000.0;