Tracker: center text horizontally again

We alwasys draw text at the bottom of the calculated TextWidget
rect, that's why it needed to be centered to get the desired
placement. However, there is two places

src/kits/tracker/TextWidget.cpp

@@ -134,7 +134,8 @@ BTextWidget::ColumnRect(BPoint poseLoc, const BColumn* column,
 	BRect result;
 	result.left = column->Offset() + poseLoc.x;
 	result.right = result.left + column->Width();
-	result.bottom = poseLoc.y + view->ListElemHeight() - 1;
+	result.bottom = poseLoc.y
+		+ roundf((view->ListElemHeight() + view->FontHeight()) / 2);
 	result.top = result.bottom - view->FontHeight();
 	return result;
 }
@@ -175,7 +176,8 @@ BTextWidget::CalcRectCommon(BPoint poseLoc, const BColumn* column,
 				break;
 		}
 
-		result.bottom = poseLoc.y + (view->ListElemHeight() - 1);
+		result.bottom = poseLoc.y
+			+ roundf((view->ListElemHeight() + view->FontHeight()) / 2);
 	} else {
 		if (view->ViewMode() == kIconMode) {
 			// large/scaled icon mode