total_grains from get_mash_info() includes non-mashed ingredients

[kschluns]

In the get_mash_info() function, total_grains = calc_percent_of_total().

calc_percent_of_total() returns the total weight of all fermentable ingredients instead of only the mashed ingredients. This creates an issue for beers like the Belgian Tripel where we use 2 lbs of candi syrup and those 2 lbs are not part of the mash bill. Therefore all the water and chemistry estimates shouldn't include those 2 lbs in their calculations. This is incorrectly inflating the water bill (not by a huge amount... ~0.25 gallons).

The solution is to have calc_percent_of_total() only return ingredients used in the mash. In the EZ Brew Spreadsheet, they track for each fermentable ingredient whether it is a mash ingredient or non-mash ingredient. We also need to do something similar on the DB-side where we track that for each grain and then account for it in the calc_percent_of_total() function.