Fix: forecast starting net worth using all transactions instead of only filtered

[ssartell]

GitHub Issue (if applicable): n/a

Trello Link (if applicable): n/a

Explanation of Bugfix/Feature/Modification:
The current forecast report bases the starting net worth off only the filtered transactions. This updates it to use all transactions (filtered by account but not date) to calculate the net worth, but keeps the filtered transactions (account and date) for running the simulation.

[narthur]

Very nice! My only concern is that it would be nice if you could forecast the future balance of a single category or the entire budget. This PR means you can forecast the entire budget's balance with filtered inputs, but doesn't allow for forecasting a single category's future balance. Not sure what the right solution is for that...

[ssartell]

@narthur you're right, this doesn't account for selecting specific categories and only works if you're forecasting your entire budget which is what I was looking to do. So if you did select a specific set of categories, would you expect your starting balance of the forecast to be the total available dollars in all of those categories?

[narthur]

@ssartell I think that's what I'd want, yes. 🤔

[joshmadewell]

@narthur @ssartell I don't really use this report at all so somewhat deferring to whether y'all think we should change this?

[joshmadewell]

OK, looking at the report and testing this locally...I think this makes sense to me a change worth making. I reckon if users don't like it...we'll hear about it.

I agree it would be interesting to respect categories across the board as filters so we could forecast categories.