Toolbar: Fix For 0x0 Image Lists

[Robert Shearman]

Hi,

This patch could cause some temporary regressions in IE, but those 
should be sorted out soon.

Rob

Changelog:
- Set cache bitmap dimensions correctly when a 0x0 image list is used.
- Optimize WM_STYLECHANGED handler to only redraw when a CCS_* style is 
changed, like native.
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