Fix «Add to ledger» → «Income»

[JoshuaLonuzzo]

Discussed in #65

^{Originally posted by Light-Feather79 December 17, 2023}
Hello, bro! Thank you very much for your plugin! I have found one little mistake in the plugin. I've been studying C# for 4 months and don't know JS syntax at all. However, I tried to solve this problem, and I believe I've succeeded.

The issue was adding income to the 'Expense Account' instead of the 'Income Account.'

I've changed two lines, and I believe it works correctly now. The modified lines are shown in the screens.