[fenix] For https://github.com/mozilla-mobile/fenix/issues/24014 - Replace @color/caption_text_private_theme with @color/fx_mobile_private_text_color_secondary

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

@@ -177,7 +177,7 @@
     <!-- Primary text -->
     <color name="fx_mobile_private_text_color_primary">@color/photonLightGrey05</color>
     <!-- Secondary text -->
-    <color name="fx_mobile_private_text_color_secondary" tools:ignore="UnusedResources">@color/photonLightGrey40</color>
+    <color name="fx_mobile_private_text_color_secondary">@color/photonLightGrey40</color>
     <!-- Disabled text -->
     <color name="fx_mobile_private_text_color_disabled">@color/photonLightGrey05A40</color>
     <!-- Warning text -->
@@ -255,7 +255,6 @@
 
     <!-- Private theme color palette -->
     <color name="secondary_text_private_theme">#A7A2B7</color>
-    <color name="caption_text_private_theme">@color/photonLightGrey70</color>
     <color name="accent_private_theme">@color/photonViolet50</color>
     <color name="accent_high_contrast_private_theme">#AA71FF</color>
     <color name="neutral_private_theme">@color/photonGrey20</color>

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

@@ -267,7 +267,7 @@
 
         <!-- Shared widget colors -->
         <item name="mozac_primary_text_color">@color/fx_mobile_private_text_color_primary</item>
-        <item name="mozac_caption_text_color">@color/caption_text_private_theme</item>
+        <item name="mozac_caption_text_color">@color/fx_mobile_private_text_color_secondary</item>
         <item name="mozac_widget_favicon_background_color">@color/photonInk50</item>
         <item name="mozac_widget_favicon_border_color">@color/photonInk50</item>