For #18496: Set activity theme in onCreate before call to super.

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

@@ -183,6 +183,8 @@ open class HomeActivity : LocaleAwareAppCompatActivity(), NavHostActivity {
         components.strictMode.attachListenerToDisablePenaltyDeath(supportFragmentManager)
         // There is disk read violations on some devices such as samsung and pixel for android 9/10
         components.strictMode.resetAfter(StrictMode.allowThreadDiskReads()) {
+            // Theme setup should always be called before super.onCreate
+            setupThemeAndBrowsingMode(getModeFromIntentOrLastKnown(intent))
             super.onCreate(savedInstanceState)
         }
 
@@ -198,7 +200,6 @@ open class HomeActivity : LocaleAwareAppCompatActivity(), NavHostActivity {
 
         components.publicSuffixList.prefetch()
 
-        setupThemeAndBrowsingMode(getModeFromIntentOrLastKnown(intent))
         setContentView(R.layout.activity_home).run {
             // Do not call anything between setContentView and inflateNavGraphAsync.
             // It needs to start its job as early as possible.