Bug 1860908 - Show the Firefox Suggest secret setting on all channels.

* In Nightly and debug builds, the secret setting is shown
  (via `FeatureFlags.fxSuggest`), and the feature is enabled by default
  via the `fx-suggest.enabled` Nimbus variable.
* In Beta and Release, we still want to show the secret setting, but
  disable the feature by default.

(cherry picked from commit d89724e922a836be24a58ee0c9d66af088d7f393)

app/src/main/java/org/mozilla/fenix/FeatureFlags.kt

@@ -72,5 +72,5 @@ object FeatureFlags {
     /**
      * Allows users to enable Firefox Suggest.
      */
-    val fxSuggest = Config.channel.isNightlyOrDebug
+    const val fxSuggest = true
 }