expand range of triangle icon active color

packages/app/src/styles/theme/_apply-colors-dark.scss

@@ -259,7 +259,7 @@ ul.pagination {
         background: $bgcolor-list-hover;
       }
 
-      .grw-triangle-icon {
+      .grw-pagetree-button {
         &:not(:hover) {
           svg {
             fill: $gray-500;

packages/app/src/styles/theme/_apply-colors-light.scss

@@ -176,7 +176,7 @@ $border-color: $border-color-global;
         background: $bgcolor-list-hover;
       }
 
-      .grw-triangle-icon {
+      .grw-pagetree-button {
         &:not(:hover) {
           svg {
             fill: $gray-400;