fix(grid): changing row-editing-styles sample colors (#3539)

Author: MarielaTihova

src/app/grid/grid-row-editing-style/grid-row-editing-style.component.scss

@@ -6,14 +6,19 @@
 }
 
 $banner-theme: banner-theme(
-    $banner-background: #e3e3e3,
-    $banner-message-color: color($purple-palette, "secondary", 600)
+    $banner-background: #494949,
+    $banner-message-color: #ffcd0f,
+);
+
+$icon-button-theme: icon-button-theme(
+    $foreground: #ffcd0f,
+    $hover-foreground: #ffffff
 );
 
 :host {
-  @include palette($purple-palette);
 
   ::ng-deep {
     @include css-vars($banner-theme);
+    @include css-vars($icon-button-theme);
   }
-}
+}