STYLE: consistent lookupOrDefault template parameters

- in many cases can just use lookupOrDefault("key", bool) instead of
  lookupOrDefault<bool> or lookupOrDefault<Switch> since reading a
  bool from an Istream uses the Switch(Istream&) anyhow

STYLE: relocated Switch string names into file-local scope

applications/utilities/mesh/manipulation/moveDynamicMesh/moveDynamicMesh.C

@@ -183,7 +183,7 @@ int main(int argc, char *argv[])
 
     bool moveMeshOuterCorrectors
     (
-        pimple.dict().lookupOrDefault<Switch>("moveMeshOuterCorrectors", false)
+        pimple.dict().lookupOrDefault("moveMeshOuterCorrectors", false)
     );
 
     while (runTime.loop())