ENH: Use scalar lookup instead of dimensionedScalar lookup

...tionDiffusionLimitedRate/COxidationDiffusionLimitedRate.C

...fusionLimitedRate/COxidationKineticDiffusionLimitedRate.C

...onModel/COxidationMurphyShaddix/COxidationMurphyShaddix.C

...irModel/PairSpringSliderDashpot/PairSpringSliderDashpot.C

...llLocalSpringSliderDashpot/WallLocalSpringSliderDashpot.C

...llModel/WallSpringSliderDashpot/WallSpringSliderDashpot.C