changed "in moving" sign to one-charactered plus-minus

src/Presentation/PortfolioPresenter.php

 class PortfolioPresenter
 {
     private const SecurityMapPrint = [
-        ['RU000A1014L8', '(в пути)'], ['LQDT', '+/-'],
+        ['RU000A1014L8', '(в пути)'], ['LQDT', '±'],
     ];
 
     private const FONT_SIZE = 12;