Fixed scoping error in wSwitchPanelSelectFirst().
We were using wwin as the temporary variable in WM_ITERATE_ARRAY() but
wwin was already set to the result of WMGetFromArray() and was due to be
returned from the function. As a result of this oversight, wwin was
always set to NULL.
The bug could cause a problem in the - admittedly rare - case where all
windows were minimised at startup, causing the first invocation of the
switchpanel to highlight the first minimised window but then fail to
raise it.
Reported by Yury Tarasievich.