[FIX] bus: useless setTimeout call

Partial backport of master fix eb52156
Solving javascript error after refresh in ie9 `Error: useless setTimeout call (missing quotes around argument?)`
[FIX] account: tax mapping logic was broken by 7508b7c

The original tax should not be applied
if at least one destination tax was
applied. It should only be applied if
explicitly included in target taxes.

(Re-)Fixes #2261