For #26227: Clean up double exclamation operator in BrowserState

app/src/main/java/org/mozilla/fenix/ext/BrowserState.kt

@@ -30,11 +30,9 @@ val maxActiveTime = TimeUnit.DAYS.toMillis(DEFAULT_ACTIVE_DAYS)
  * @return A list of the last opened tab or an empty list.
  */
 fun BrowserState.asRecentTabs(): List<RecentTab> {
-    return if (lastOpenedNormalTab == null) {
-        mutableListOf()
-    } else {
-        mutableListOf(RecentTab.Tab(lastOpenedNormalTab!!))
-    }
+    return lastOpenedNormalTab?.let {
+        mutableListOf(RecentTab.Tab(it))
+    } ?: mutableListOf()
 }
 
 /**