fix(dock-manager): add some updates:

- add the right selector for the selected columns styling
- change styles for the disabled chip

Author: viktorkombov

projects/app-lob/src/app/grid-finjs-dock-manager/grid-finjs-dock-manager.component.scss

@@ -127,13 +127,7 @@
 	}
 }
 
-.dark-theme {
-    --igx-grid-row-selected-background: #084d8d;
-    --igx-grid-row-selected-hover-background: #0d78db;
-    --igx-grid-header-selected-background: #0d78db;
-}
-
-:host ::ng-deep {
+igx-grid {
 	.grid-area {
 		margin-block-start: 1rem;
 		overflow-y: hidden;

projects/app-lob/src/styles.scss

@@ -29,8 +29,15 @@ body {
     .grid-chart-contextmenu-wrapper {
         @include fluent-dark-theme($fluent-excel-palette);
     }
+    igx-grid,
+    igx-hierarchical-grid,
+    igx-pivot-grid,
+    igx-tree-grid {
+        --igx-chip-disabled-background: #616161;
+        --igx-chip-disabled-border-color: #616161;
+        --igx-chip-disabled-text-color: #BDBDBD;
+    }
 }
-
 .fin-dark-theme {
     @include dark-theme($green-palette);
     background: #333;