Invert default ctrl+mouse wheel zoom behavior

**Is your feature request related to a problem? Please describe.**
no

**Describe the solution you'd like**
When zooming into images of annotations using ctrl+mousewheel, it is unintuitive, it's backwards.

current behavior: mouse wheel-up zooms in, and mousewheel down zooms out
desired behavior: mouse wheel-down zooms in, and mousewheel up zooms out ( just like in every other application)

**Describe alternatives you've considered**
having an option to change this (in the case that the default won't be changed)