Render editor brush selection size with ⨯ instead of ,

For example, `20⨯10` instead of `20,10`.

This is the "vector" symbol, which makes the most sense in this context.

src/game/editor/mapitems/layer_tiles.cpp

@@ -237,7 +237,7 @@ void CLayerTiles::BrushSelecting(CUIRect Rect)
 	m_pEditor->Graphics()->QuadsDrawTL(&QuadItem, 1);
 	m_pEditor->Graphics()->QuadsEnd();
 	char aBuf[16];
-	str_format(aBuf, sizeof(aBuf), "%d,%d", ConvertX(Rect.w), ConvertY(Rect.h));
+	str_format(aBuf, sizeof(aBuf), "%d⨯%d", ConvertX(Rect.w), ConvertY(Rect.h));
 	TextRender()->Text(Rect.x + 3.0f, Rect.y + 3.0f, m_pEditor->m_ShowPicker ? 15.0f : m_pEditor->MapView()->ScaleLength(15.0f), aBuf, -1.0f);
 }