move grw-pagetree-triangle-btn into grw-pagetree class

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

@@ -284,6 +284,9 @@ ul.pagination {
       lighten($bgcolor-list-hover, 5%),
       $gray-500
     );
+    .grw-pagetree-triangle-btn {
+      @include button-outline-svg-icon-variant($secondary, $gray-200);
+    }
     .grw-pagetree-count {
       color: $gray-400;
       background: $gray-700;
@@ -296,10 +299,6 @@ ul.pagination {
   }
 }
 
-.grw-pagetree-triangle-btn {
-  @include button-outline-svg-icon-variant($secondary, $gray-200);
-}
-
 // Page Management Dropdown icon
 .btn.btn-page-item-control {
   @include button-outline-variant($gray-500, $gray-500, $secondary, transparent);

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

@@ -179,6 +179,9 @@ $border-color: $border-color-global;
       $bgcolor-list-active,
       $gray-400
     );
+    .grw-pagetree-triangle-btn {
+      @include button-outline-svg-icon-variant($gray-400, $primary);
+    }
     .grw-pagetree-count {
       color: $gray-500;
       background: $gray-200;
@@ -191,10 +194,6 @@ $border-color: $border-color-global;
   }
 }
 
-.grw-pagetree-triangle-btn {
-  @include button-outline-svg-icon-variant($gray-400, $primary);
-}
-
 .btn.btn-page-item-control {
   @include button-outline-variant($gray-500, $primary, lighten($primary, 52%), transparent);
   @include hover() {