[fenix] For https://github.com/mozilla-mobile/fenix/issues/23925 - Update tab counter and reader mode colors to use the design system

app/src/main/res/values-night/colors.xml

@@ -157,6 +157,6 @@
     <color name="mozac_feature_readerview_text_color">@color/fx_mobile_text_color_primary</color>
 
     <!-- Tab Counter colors -->
-    <color name="mozac_ui_tabcounter_default_tint" tools:ignore="UnusedResources">@color/photonLightGrey05</color>
+    <color name="mozac_ui_tabcounter_default_tint" tools:ignore="UnusedResources">@color/fx_mobile_icon_color_primary</color>
     <color name="mozac_ui_tabcounter_default_text" tools:ignore="UnusedResources">@color/fx_mobile_text_color_primary</color>
 </resources>

app/src/main/res/values/colors.xml

@@ -329,7 +329,7 @@
     <color name="snackbar_error_color">#B52645</color>
 
     <!-- Reader View colors -->
-    <color name="mozac_feature_readerview_text_color" tools:ignore="UnusedResources">@color/primary_text_light_theme</color>
+    <color name="mozac_feature_readerview_text_color" tools:ignore="UnusedResources">@color/fx_mobile_icon_color_primary</color>
     <color name="mozac_feature_readerview_selected">@color/photonViolet40</color>
 
     <!-- Share UI -->
@@ -355,8 +355,8 @@
     <color name="search_view_hint_color">@color/photonDarkGrey05</color>
 
     <!-- Tab Counter colors -->
-    <color name="mozac_ui_tabcounter_default_tint" tools:ignore="UnusedResources">@color/primary_text_light_theme</color>
-    <color name="mozac_ui_tabcounter_default_text" tools:ignore="UnusedResources">@color/primary_text_light_theme</color>
+    <color name="mozac_ui_tabcounter_default_tint" tools:ignore="UnusedResources">@color/fx_mobile_icon_color_primary</color>
+    <color name="mozac_ui_tabcounter_default_text" tools:ignore="UnusedResources">@color/fx_mobile_text_color_primary</color>
 
     <!-- App Spinners colors -->
     <color name="spinner_selected_item">#1415141A</color>