Fix direction of zoom
Fix direction of zoom

To match FireFox behavior, rolling the top of the wheel away
from me should zoom in

StephenMcConnel/BloomDesktop,andrew-polk/BloomDesktop,StephenMcConnel/BloomDesktop,BloomBooks/BloomDesktop,gmartin7/myBloomFork,JohnThomson/BloomDesktop,andrew-polk/BloomDesktop,BloomBooks/BloomDesktop,JohnThomson/BloomDesktop,JohnThomson/BloomDesktop,StephenMcConnel/BloomDesktop,BloomBooks/BloomDesktop,StephenMcConnel/BloomDesktop,gmartin7/myBloomFork,BloomBooks/BloomDesktop,andrew-polk/BloomDesktop,andrew-polk/BloomDesktop,gmartin7/myBloomFork,StephenMcConnel/BloomDesktop,BloomBooks/BloomDesktop,JohnThomson/BloomDesktop,BloomBooks/BloomDesktop,gmartin7/myBloomFork,JohnThomson/BloomDesktop,gmartin7/myBloomFork,andrew-polk/BloomDesktop,StephenMcConnel/BloomDesktop,andrew-polk/BloomDesktop,gmartin7/myBloomFork