WS-108 Update homograph numbers unit test to match new implementation

The implementation was changed in ac36677

Change-Id: I2c7996bceaa2392019d57a69f541854e326d9bc1
Fix PageDown key

PageDown/PageUp key does not work for many controls.
When the ListControl on the Left is active the PageDown/PageUp does
not work. Implemented TodoRecordsListBox_OnKeyDown to handle these.
The "Base Forms" page needed an implementation of OnKeyDown to handle
these keys, and also needed to override IsInputKey.(WS-126)

Change-Id: I384bb14ca5aa8630bed5c9cafa5088e13584860a