Issue #3363127 by nod_, Gábor Hojtsy, mherchel: Drupal Displace outputs...

Issue #3363127 by nod_, Gábor Hojtsy, mherchel: Drupal Displace outputs invalid value for --drupal-displace-offset-right when opening top dialog

(cherry picked from commit 3401675c)

core/misc/dialog/off-canvas/js/off-canvas.js

@@ -287,6 +287,7 @@
           `${width}px`;
 
         $container.attr(`data-offset-${Drupal.offCanvas.getEdge()}`, width);
+        $container.attr('data-offset-top', 0);
         displace();
       }
 
@@ -294,6 +295,7 @@
       if (position === 'top') {
         mainCanvasWrapper.style.paddingTop = `${height}px`;
         $container.attr('data-offset-top', height);
+        $container.attr(`data-offset-${Drupal.offCanvas.getEdge()}`, 0);
         displace();
       }
     },