minor fix for max-element-size. The minsize needs to be calc and cached during the regular reflow

there is too much state to be remember to calc the min size for when ever it is asked for it.
(see also fix nsBoxFramae.cpp)
b=40596 r=evaughan

layout/html/forms/src/nsGfxTextControlFrame2.cpp

@@ -1920,7 +1920,7 @@ nsGfxTextControlFrame2::GetPrefSize(nsBoxLayoutState& aState, nsSize& aSize)
 NS_IMETHODIMP
 nsGfxTextControlFrame2::GetMinSize(nsBoxLayoutState& aState, nsSize& aSize)
 {
-
+#define FIX_FOR_BUG_40596
 #ifdef FIX_FOR_BUG_40596
   aSize = mMinSize;
   return NS_OK;