Codechange: Vertical spacing for caption is captiontext, not framerect. (#11550)

This does not really matter as the caption height is sized correctly later anyway, so this just avoids confusion.

src/widget.cpp

@@ -2738,7 +2738,7 @@ NWidgetLeaf::NWidgetLeaf(WidgetType tp, Colours colour, int index, uint32_t data
 			this->SetFill(1, 0);
 			this->SetResize(1, 0);
 			this->SetMinimalSize(0, WD_CAPTION_HEIGHT);
-			this->SetMinimalTextLines(1, WidgetDimensions::unscaled.framerect.Vertical(), FS_NORMAL);
+			this->SetMinimalTextLines(1, WidgetDimensions::unscaled.captiontext.Vertical(), FS_NORMAL);
 			this->SetDataTip(data, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS);
 			break;