For #5270 - Adds state list color for delete browsing checkboxes

app/src/main/res/color/secondary_state_list_text_color.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_enabled="false" android:color="?disabled" />
+    <item android:color="?secondaryText"/>
+</selector>

app/src/main/res/layout/delete_browsing_category_checkbox.xml

@@ -27,6 +27,7 @@
 
     <TextView
         android:id="@android:id/title"
+        android:textColor="@color/state_list_text_color"
         android:layout_width="0dp"
         android:layout_height="wrap_content"
         android:textSize="16sp"
@@ -41,6 +42,7 @@
         android:id="@android:id/summary"
         android:layout_width="0dp"
         android:layout_height="wrap_content"
+        android:textColor="@color/secondary_state_list_text_color"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toEndOf="@android:id/widget_frame"