Fixes for scroll.c

[Guy L. Albertelli]

A weird app used the scroll control and did a SetCapture after passing the
LBUTTONDOWN msg to control. It assumed that the LBUTTONUP message would be
consumed inside the control's LBUTTONDOWN processing.

Changelog:
Guy Albertelli  <<galberte at neo.lrun.com>>

  controls/scroll.c
   - Implement message loop on the client side of the scroll control. (The
     message loop is already in the nonclient portion (see nonclient.c).)
   - Move the mouse capture to after the SetFocus so that it stays capture.
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