[0.4.11] Revert "[COMCTL32] button: Don't erase the area of the checkbox or the text."

This reverts last commit 0.4.11-RC-28-g
fc9e7ba.

Okay, I changed my mind:
fc9e7ba fixed the flickering for the text,
but would leave the flickering existant for the selection rectangle and also
for the checkmarks/radio-button-circle.
On its own it would only half-fix CORE-13278 therefore.
More problematic is that it would introduce a new regression CORE-15595.

I revert it because I do not want to transform 1 regression into 1,5regressions.
Test-results are easier to maintain with that conservative approach.
Seems we have to endure the flickering for another release :-(

Author: JoachimHenze

dll/win32/comctl32/button.c

@@ -1550,9 +1550,7 @@ static void CB_Paint( const BUTTON_INFO *infoPtr, HDC hDC, UINT action )
 
     /* Since WM_ERASEBKGND does nothing, first prepare background */
     if (action == ODA_SELECT) FillRect( hDC, &rbox, hBrush );
-#ifndef __REACTOS__
     if (action == ODA_DRAWENTIRE) FillRect( hDC, &client, hBrush );
-#endif
 
     /* Draw label */
     client = rtext;
@@ -1618,15 +1616,6 @@ static void CB_Paint( const BUTTON_INFO *infoPtr, HDC hDC, UINT action )
     if (action == ODA_DRAWENTIRE)
         BUTTON_DrawLabel(infoPtr, hDC, dtFlags, &rtext);
 
-#ifdef __REACTOS__
-    if (action == ODA_DRAWENTIRE)
-    {
-        ExcludeClipRect(hDC, rbox.left, rbox.top, rbox.right, rbox.bottom);
-        ExcludeClipRect(hDC, rtext.left, rtext.top + 1, rtext.right, rtext.bottom - 1);
-        FillRect( hDC, &client, hBrush );
-    }
-#endif
-
     /* ... and focus */
     if (action == ODA_FOCUS || (state & BST_FOCUS))
     {