Toolbar: Simplify and Fix Sizing Code [5/6]

[Robert Shearman]

Changelog:
- Height is now calculated based on the number of rows, not on the 
bounding rect.
- Only call CalcToolbar in AutoSize if it has TBSTYLE_WRAPABLE or 
TBSTYLE_EX_UNDOC1 set.
- Remove a bad test in SetButtonWidth that fixes a regression from the 
above change in IE.
- Remove unnecessary nHeight data.
- Remove duplicated code in Size by calling AutoSize.
- Remove unnecessary bAutoSize value because SetWindowPos doesn't 
generate WM_SIZE when there is nothing to do on both Windows and Wine.

-- 
Rob Shearman

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