For #12062 - Remove feature flag for return to browser (#16622)

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

@@ -35,9 +35,4 @@ object FeatureFlags {
      * Enables ETP cookie purging
      */
     val etpCookiePurging = Config.channel.isNightlyOrDebug
-
-    /**
-     * Returns user to browser on cold start if they have open tabs
-     */
-    val returnToBrowserOnColdStart = Config.channel.isNightlyOrDebug
 }

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

@@ -770,8 +770,7 @@ open class HomeActivity : LocaleAwareAppCompatActivity(), NavHostActivity {
     open fun navigateToBrowserOnColdStart() {
         // Normal tabs + cold start -> Should go back to browser if we had any tabs open when we left last
         // except for PBM + Cold Start there won't be any tabs since they're evicted so we never will navigate
-        if (FeatureFlags.returnToBrowserOnColdStart &&
-            settings().shouldReturnToBrowser &&
+        if (settings().shouldReturnToBrowser &&
             !browsingModeManager.mode.isPrivate
         ) {
             openToBrowser(BrowserDirection.FromGlobal, null)