For #24014 - Replace @color/secondary_text_private_theme with @color/fx_mobile_private_text_color_secondary

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

@@ -254,7 +254,6 @@
     <color name="tab_tray_item_selected_background_dark_theme">#412E69</color>
 
     <!-- Private theme color palette -->
-    <color name="secondary_text_private_theme">#A7A2B7</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

@@ -230,7 +230,7 @@
 
         <!-- Updated color attributes -->
         <item name="primaryText">@color/fx_mobile_private_text_color_primary</item>
-        <item name="secondaryText">@color/secondary_text_private_theme</item>
+        <item name="secondaryText">@color/fx_mobile_private_text_color_secondary</item>
         <item name="contrastText">@color/fx_mobile_private_text_color_primary</item>
         <item name="accent">@color/accent_private_theme</item>
         <item name="accentBright">@color/photonViolet70</item>