I'm not so sure about that. While you may have a point that allowing the colonists to settle in Louisiana, wasn't the point of the Proclamation of 1763 to prevent conflicts with Indian tribes now under British protection? Those tribes would still be there and might still object to being forced out by American settlers moving west.
This was only one of the reasons. The others were that (a) the French fur trade around the Great Lakes and down the Mississippi was a money spinner, and settlers would interfere with this, potentially cutting off a lucrative source of revenue and (b) the British wanted to divert settlement so the whole coast was settled. That way no other European colonies could grab a foothold. These will obviously still hold also, but I can't see it having much effect on the Revolution, as the proclamation line issue was fairly quickly settled.
There are other ways it could affect the Revolution, however. Firstly, there will be a need for British troops to be stationed along the border with Spain. This solves the issue for HMG of "what do we do with all these spare troops?" that ended up with them being put in the thirteen colonies in our timeline, causing much animosity. It also solves it in a way that will be valued by the colonists, who will want the new land protected for English settlement and will know there's not enough population there yet for local militias to do it.
Secondly, the colonists will know there's no way they would be able to conquer the port of New Orleans in the revolution, which means if they get independence they'll be encircled by a hostile power and will also be damning a trade route that is vital for future expansion.