objectRegistry: Set the path of the Time objectRegistry

Patch contributed by Bruno Santos
Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=2030

src/OpenFOAM/db/objectRegistry/objectRegistry.C

@@ -55,7 +55,7 @@ Foam::objectRegistry::objectRegistry
         IOobject
         (
             string::validate<word>(t.caseName()),
-            "",
+            t.path(),
             t,
             IOobject::NO_READ,
             IOobject::AUTO_WRITE,