Save zoom state when resizing dialogs

[bparks13]

If a dialog is resized (maximizing the window for example), it resets the zoom state to be fully zoomed out. This is potentially annoying, but not a critical feature to fix.

Should be a simple matter of grabbing the current axis boundaries during the Resize event, and applying them after the resizing is complete.

[bparks13]

Example GIF of the behavior in question.

Note that this does not affect the Rhs2116 stimulus sequence dialog, but it does affect the ChannelConfigurationDialog.