Revert the formulation of biofuel limit to apply only to the transport sector

Jerome Hilairerequested to merge
github/fork/Loisel/fix/bioshare_eq into develop

Created by: Loisel

The other formulation which applied to all liquids is more consistent with the reporting (on blend serves them all), but to only constrain the biofuel supplies to the transport sector leaves more flexibility to REMIND.

Sorry for the back-and-forth.

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