[fenix] For https://github.com/mozilla-mobile/fenix/issues/21973 - Remove @color/secondary_text_dark_theme redirection

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

@@ -5,7 +5,7 @@
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Normal theme colors for dark mode -->
     <color name="primary_text_normal_theme">@color/primary_text_dark_theme</color>
-    <color name="secondary_text_normal_theme">@color/secondary_text_dark_theme</color>
+    <color name="secondary_text_normal_theme">#A7A2B7</color>
     <color name="contrast_text_normal_theme">@color/contrast_text_dark_theme</color>
     <color name="caption_text_normal_theme">@color/caption_text_dark_theme</color>
     <color name="foundation_normal_theme">@color/foundation_dark_theme</color>

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

@@ -76,7 +76,6 @@
 
     <!-- Dark theme color palette -->
     <color name="primary_text_dark_theme">@color/photonLightGrey05</color>
-    <color name="secondary_text_dark_theme">#A7A2B7</color>
     <color name="contrast_text_dark_theme">@color/primary_text_dark_theme</color>
     <color name="caption_text_dark_theme">@color/photonLightGrey70</color>
     <color name="foundation_dark_theme">@color/photonDarkGrey80</color>